User Manual 2008
Product Guide
WEST SYSTEM epoxy products make up a versatile epoxy system that can be used for everything
from basic long-lasting repairs to the construction of high-performance composite structures.
Select the products that allow you to tailor the epoxy to your working conditions and application.
Product Selection
Getting Started
This is a basic epoxy tool kit, a list
of the most commonly used products for general repair and construction. You can add to or modify the list as your job requires.
Refer to the Product Guide for detailed product information.
o 105 Resin
This Product/Application Overview shows how bonding, filling and coating applications
are related to combinations of specific products.
Mix with one of four W
Add one of six W
Start with 105 Resin,
Hardeners. Se- 3 fillers to thicken the mixture as
the basic ingredient 2 S
ep- lect a hardener for its in- needed. Select a filler for its hanof all W
oxy compounds. Use
300 Mini Pumps for
convenient and accurate metering.
tended use and for the cure
speed best suited for your job
in the temperature range in
which you are working.
Select Group Size A, B, or C
(see coverage chart, page 18.)
o Hardener
205 for general use, or
206 for extra working
time/warmer temperatures
209 for high temperatures
207 for clear finishes
(select a Group Size to match
resin, see detailed hardener
descriptions, page 19.)
o 300 Mini Pumps
For convenient metering
o Filler (thickener)
As needed
406 Adhesive Filler for general structural bonding/gap filling, or
407 Fairing Filler for sandable
surface filling/fairing
(see detailed filler descriptions, page 22.)
o Application tools
As needed
Typical hardware products or
recycled household items can
be used for some application
Use 800 Roller Covers for a
smooth coating.
(see detailed tool descriptions,
page 26.)
o Instruction
The publications shown on
page 17 provide detailed instructions for building and repair.
For additional help with specific projects contact the
Gougeon technical staff,
866-937-8797 (toll free).
WEST SYSTEM User Manual & Product Guide
dling characteristics or cured physical properties. Or, add one of four
WEST SYSTEM additives to provide
specific coating properties.
Product Guide
002 The Gougeon Brothers on Boat Construction
002-150 Vacuum Bagging Techniques
Decades of experience building with wood and epoxy are
compiled in this classic on wood/epoxy boatbuilding. Extensive chapters on lofting, safety, tools and construction methods are described with the aid of hundreds of detailed illustrations and photographs. This 5th edition includes about
20% new and updated material and a revised layout for easier navigation. Used as a textbook in boatbuilding schools.
Over 100,000 copies in print. Hardcover—406 pages.
A definitive guide to the principles and application of vacuum bagging techniques for laminating composite materials
with epoxy. Complete instructions describe various techniques; materials and equipment. Softcover—52 pages.
002-970 Wooden Boat Restoration & Repair
This manual shows you how to do professional level repairs
and renovations that dramatically extend the life of your
wooden boat. Dry rot repairs, structural frame repairs, and
plank repairs using modern products and techniques are
among the many solutions covered in this fully illustrated
manual. Softcover—80 pages.
002-550 Fiberglass Boat Repair & Maintenance
This is a complete, illustrated guide to a variety of fiberglass
repair problems, including detailed instructions on repairing
cracks and holes, delamination, rot and keel damage. It also
covers fairing keels, hardware bonding, finishing and installing teak veneers. Softcover—84 pages.
002-650 Gelcoat Blisters: Diagnosis, Repair &
This manual provides a thorough explanation of osmotic
blistering, and detailed, illustrated instructions on effective
laminate drying techniques, repairing localized and severe
interlaminate blister damage, techniques for applying an effective epoxy barrier coat and more. Softcover—52 pages.
002-740 Final Fairing & Finishing
This guide takes you through the final steps of the building
or repair process in detail. Includes techniques for fairing
and barrier coating, as well as information on the characteristics and types of finishing coatings. Softcover—28 pages.
002-898 WEST SYSTEM Epoxy How-To DVD
A compilation of three instructional videos demonstrating
basic handling and advanced epoxy repair techniques.
Basic Application Techniques—A guide to the optimum use of
WEST SYSTEM epoxy products, including epoxy safety and
procedures for coating, bonding and fairing.
Fiberglass Repair with WEST SYSTEM Epoxy—Using WEST
SYSTEM epoxy to make structural repairs on fiberglass boats,
including repairs to cored and non-cored hulls and how to
apply gelcoat over epoxy repairs.
Gelcoat Blister Repair with WEST SYSTEM Epoxy—A guide for repairing and preventing gelcoat blisters on fiberglass boats.
Analyzing the causes of blister formation, preparing and drying fiberglass hulls, and repairing and coating for moisture
protection with WEST SYSTEM epoxy.
Interactive menus allow for easy navigation through these
subjects. DVD—59 minutes.
Supplemental Publications
FREE (USA and Canada only)
three-year (6 issues) subscription to the semiannual magazine published by Gougeon
Brothers Inc. Discusses boat
building, restorations, repairs,
events, interesting projects, the
latest techniques and helpful
tips related to epoxy. Articles
highlight readers projects and
news from our test labs.
Subscribe to EPOXYWORKS by writing or calling Gougeon
Brothers, or visit You can also view
EPOXYWORKS on line at
002-960 Technical Data Package
The Technical Data Package, available free upon request, includes the following publications:
000-574 Epoxy Safety, 000-742 Quality Assurance Considerations, 000-7105 WEST SYSTEM Epoxy Physical Properties, 000-800 Thinning WEST SYSTEM Epoxy, 000-915 Cold
Temperature Bonding and Coating with Epoxy, 000-545
Fatigue, 000-745 Moisture Exclusion Effectiveness (MEE).
Material Safety Data Sheets
MSDS for specific WEST SYSTEM products are available at, through WEST SYSTEM distributors
or by contacting Gougeon Brothers Inc. For additional information about the use or suitability of WEST SYSTEM products contact the Gougeon Technical Staff at 866-937-8797.
WEST SYSTEM User Manual & Product Guide
Product Guide
WEST SYSTEM epoxy cures to a high-strength plastic solid at
room temperatures, by mixing specific proportions of liquid
epoxy resin and hardener. This highly moisture-resistant plastic adheres to a wide range of materials, making it ideal for projects that require water and chemical resistence, and strong
physical properties for structural bonding. Select from a range
of hardeners and additives that allow you to tailor the mixture’s handling characteristics and the physical properties of
the cured epoxy to suit your working conditions and specific
coating or bonding application.
Epoxy Resin
105 Epoxy Resin
105 Resin is the base material of the WEST SYSTEM compounds are built. The resin is a clear, pale yellow, low-viscosity liquid epoxy resin. Formulated for use with WEST
SYSTEM hardeners, it can be cured in a wide temperature
range to form a high-strength solid with excellent moisture
105 Resin is formulated without volatile solvents and does
not shrink after curing. It has a relatively high flash point and
no strong solvent odor, making it safer to work with than
polyester or vinylester resins. Resin viscosity is approximately 1000 centipoise (cP) at 72°F (22°C).
105 Resin is designed specifically to wet out and bond with
wood fiber, fiberglass, reinforcing fabrics and a variety of
metals when mixed at the proper ratio with a WEST SYSTEM
Group size quantities and coating coverage
WEST SYSTEM epoxy resin and hardeners are packaged in three
“Group Sizes.” For each container size of resin, there is a corresponding sized container of hardener. When purchasing resin
and hardener, be sure both containers are labeled with the
same Group Size letter (A, B or C).
hardener. An excellent adhesive, 105 mixtures will bridge
gaps and fill voids when modified with WEST SYSTEM fillers
and can be sanded and shaped when cured. With roller applications, it has excellent thin-film characteristics to flow out
and self-level without “fisheyeing.” 105 Resin/207 Hardener mixtures cure clear so you can achieve a natural finish
when coating with varnish.
Estimated epoxy coverage for fabric application
Product number
(see page 24)
per yd2
Saturation coat
single fabric layer*
(see page 10)
Fill coats
2–3 coats required
(see page 11)
4 oz
29 ft2/lb
35 ft2/lb
6 oz
20 ft2/lb
33 ft2/lb
729, 731, 732, 733
9 oz
13 ft2/lb
31 ft2/lb
12 oz
10 ft /lb
28 ft2/lb
727, 737
17 oz
8 ft2/lb
26 ft2/lb
23.8 oz
5 ft2/lb
20 ft2/lb
* includes 20% waste factor. (see chart below for Group Size mixed quantity in pounds)
Resin/Hardener Group
Group Size A
1 qt (.94 L)
2.40 lb
Group Size B
.98 gal (3.74 L)
9.50 lb
Group Size C
4.35 gal (16.47 L)
41.82 lb
Saturation coat
porous surfaces
Buildup coats
non-porous surfaces
205-A or 206-A
.43 pt (.20 L)
.47 lb
1.2 qt (1.15 L)
2.87 lb
90–105 ft2
120–135 ft2
(11–12.5 m2)
207-A or 209-A
.66 pt (.31 L)
.70 lb
1.3 qt (1.26 L)
3.1 lb
90–105 ft2
(9–10 m2)
120–135 ft2
(11–13 m2)
205-B or 206-B
.86 qt (.81 L)
1.86 lb
1.2 gal (4.55 L)
11.36 lb
350–405 ft2
(32–37 m2)
462–520 ft2
(43–48 m2)
207-B or 209-B
1.32 qt (1.24 L)
2.75 lb
1.3 gal (4.98 L)
12.25 lb
370–430 ft2
(35–40 m2)
490–550 ft2
(45–50 m2)
205-C or 206-C
.94 gal (3.58 L)
8.20 lb
5.29 gal (20 L)
50.02 lb
1530–1785 ft2
(142–165 m2)
2040–2300 ft2
(190–213 m2)
207-C or 209-C
1.45 gal (5.49 L)
12.0 lb
5.8 gal (21.9 L)
53.82 lb
1675–1955 ft2
(155–180 m2)
2235–2520 ft2
(207–233 m2)
WEST SYSTEM User Manual & Product Guide
Product Guide
Selection Guide
Select a hardener for
its intended use and
for the cure speed
best suited for your
job in the temperature
range in which you are
General bonding, fabric application
and barrier coating
General bonding, fabric application
and barrier coating
Clear fabric application and clear
coating for a natural wood finish
General bonding, fabric application
and barrier coating
Room Temp.
CURE SPEEDS at room temp.*
100g cupful
thin film
thin film
*Epoxy cures faster in warmer temperatures and in thicker applications—Epoxy cures slower in cooler temperatures and in thinner applications.
Epoxy Hardeners 5:1 Ratio
205 Fast Hardener
206 Slow Hardener
205 Fast Hardener is a medium-viscosity epoxy curing
agent. It is used in a majority of situations, at lower temperatures and to produce a rapid cure that develops its physical
properties quickly at room temperature. When mixed with
the 105 Resin in a five-part resin to one-part hardener ratio,
the cured resin/hardener mixture yields a rigid,
high-strength, moisture-resistant solid with excellent bonding and coating properties. Not intended for clear coating.
Pot life at 72°F (22°C) . . . . . . . . . . 9 to 12 minutes
Cure to a solid state . . . . . . . . . . . . . 6 to 8 hours
Cure to maximum strength . . . . . . . . . . 1 to 4 days
Minimum recommended temperature . . . . 40°F (4°C)
206 Slow Hardener is a low-viscosity epoxy curing agent for
use when extended working and cure time is needed or to
provide adequate working time at higher temperatures.
When combined with 105 Resin in a five-part resin to
one-part hardener ratio, the cured resin/hardener mixture
yields a rigid, high-strength, moisture-resistant solid with
excellent bonding and coating properties. Not intended for
clear coating.
Pot life at 72°F (22°C). . . . . . . . . . 20 to 25 minutes
Cure to a solid state . . . . . . . . . . . . 10 to 15 hours
Cure to maximum strength . . . . . . . . . . 1 to 4 days
Minimum recommended temperature . . . . 60°F (16°C)
Epoxy Hardeners 3:1 Ratio
207 Special Coating Hardener
209 Extra Slow Hardener
207 Special Coating Hardener was developed for coating
and fiberglass cloth application where an exceptionally
clear, moisture-resistant, natural wood finish is desired.
WEST SYSTEM 105/207 mixtures resist clouding in humid
conditions and exhibit extremely low blush formation—as
low as any epoxy you will find anywhere, including so-called
“no blush” epoxies.
Professional and first-time builders like 207 because it is reliable and easy to use. Three coats or more can be applied in
one day without additional surface preparation. Fewer coats
are required to fill fiberglass weave and in most cases the final coating can be sanded the following day. Boats can be
built faster. Builders also appreciate the excellent fiberglass
wet-out characteristics achieved with 105/207, yet it won’t
drain from vertical surfaces like the very slow curing,
low-viscosity epoxies.
105/207 has strong physical properties, so it can be used as a
structural adhesive for gluing and laminating. It has excellent compatibility with paints and varnishes. An ultraviolet
inhibitor in 207 helps provide a beautiful, long lasting finish
when used with quality UV-filtering varnish. 105/207 cures
to a light amber color, similar to traditional spar varnishes.
Pot life at 72°F (22°C). . . . . . . . . . 22 to 27 minutes
Cure to a solid state . . . . . . . . . . . . 12 to 18 hours
Cure to maximum strength . . . . . . . . . . 4 to 7 days
Minimum recommended temperature . . . . 60°F (16°C)
209 Extra Slow Hardener is formulated for general coating
and bonding applications in extremely warm and/or humid
conditions or when extended working time is desired at
room temperature. Provides approximately twice the working time of 206 Slow Hardener. Forms a clear, amber-colored solid with good physical properties and moisture resistance for bonding and coating applications. Not intended
for clear coating.
Pot life at 72°F (22°C). . . . . . . . . . 40 to 50 minutes
at 95°F (35°C). . . . . . . . . . 15 to 20 minutes
Cure to a solid state at 72°F (22°C) . . . . 20 to 24 hours
at 95°F (35°C) . . . . . 6 to 8 hours
Cure to maximum strength at 72°F . . . . . . 4 to 9 days
Minimum recommended temperature . . . . 70°F (21°C)
Storage/Shelf life
Store at room temperature. Keep containers closed to prevent contamination. With proper storage, resin and hardeners should remain
usable for many years. Over time, 105 Resin will thicken slightly
and will therefore require extra care when mixing. Repeated
freeze/thaw cycles during storage may cause crystallization of 105
Resin. Warm resin to 125°F and stir to dissolve crystals.
Hardeners may darken with age, but physical properties are not affected by color. After a long storage,verify the metering accuracy of
the pumps and mix a small test batch to assure proper curing.
WEST SYSTEM User Manual & Product Guide
Product Guide
Metering Pumps
300 Mini Pump Set
Large Capacity Pumps
300 Mini Pumps are designed for convenient and accurate
metering of Group Size A, B and C WEST SYSTEM 105
Resin-based epoxy. The 300 Mini Pump Set contains one
resin pump and two hardener pumps. Pumps mount directly
on the resin and hardener containers and eliminate the mess
involved with measuring by weight or volume.
300 Mini Pumps are calibrated to deliver the proper working ratio with one full pump stroke of resin for each one full
pump stroke of hardener. 105/205-206 pumps deliver approximately 0.8 fl oz of resin/hardener with one full stroke
of each pump. 105/207-209 pumps deliver approximately
0.9 fl oz of resin/hardener with one full stroke of each pump.
As packaged, the pumps are ready to install on the Group
Size B containers. A package of extension tubes for Group
Size A containers is included with the set. Group Size C extension tubes are included in the 105-C Resin and in the
207-SC or 209-SC packages.
Made of durable polypropylene, the pumps give years of dependable service. Read and follow the priming, ratio verification and operating instructions that come with the pumps.
306-25 Metering Pump
306-23 Metering Pump
Similar to 306-25 Metering Pump described above. For metering 105 Resin and 207 Special Coating or 209 Extra Slow
(3:1 ratio) Hardeners. Can be converted to 5:1 ratio.
306-K235 Rebuild Kit
For 306-25 (5:1) ratio and 306-23 (3:1) ratio pumps. Includes seals, balls, gaskets, springs, high-rise tubes with ferrules and new resin and hardener reservoirs with lids.
306-K and 306-3K Rebuild Kits for older model 306 (single
body) dispensing pumps.
309 High-Capacity Gear Pump
Metering scale
320 Small-Batch Epoxy Scale
For batches smaller than one Mini Pump stroke, the 320
scale accurately measures the correct ratio of resin and hardener from 4.4 fl oz down to just a few drops of mixed product. The scale can also be used to confirm the accuracy of
your WEST SYSTEM dispensing pumps and to consistently
add pigments or other
additives. The scale comes in a convenient kit
for small projects. The
kit includes dispensing
bottles, 3¼ oz and 1 oz
plastic mixing cups,
mixing sticks, and pipe
For metering larger quantities of 105 Resin and 205 or 206
(5:1 ratio) Hardeners. The 306-25 Pump will reduce mixing
time and waste on large projects. A carrying handle allows
you to move the pump where the works is. Reservoirs hold
one gallon of resin, one quart of hardener. Dispenses approximately 0.5 fl oz of resin/hardener per pump stroke
(about 1 qt per minute). Can be converted to a 3:1 ratio.
For use with 205 or 206 (5:1 ratio) Hardeners. The 309
Gear Pump is designed and built by Gougeon Brothers for
large projects and manufacturing operations. The home
builder and professional alike will enjoy the efficiency of this
high-volume pump. With continuous rotation of the crank,
the metered resin and hardener can be delivered at up to five
quarts per minute. Positive shutoff prevents resin and hardener loss through dripping spouts. The convenient handle
makes it easy to carry the pump to right where it’s needed.
Stainless steel reservoirs hold two gallons of resin, one gallon
of hardener.
309-3 High-Capacity Gear Pump
Similar to 309 High-Capacity Gear Pump described above.
For metering 105 Resin and 207 Special Coating or 209 Extra Slow (3:1 ratio) Hardeners.
WEST SYSTEM User Manual & Product Guide
Product Guide
Repair Packs
101 Handy Repair Pack
Here is everything you need to complete small repairs
around the boat, shop or home. The Handy Repair Pack
contains two WEST SYSTEM 105 Resin/205 (fast) Hardener
packets, and enough adhesive filler to complete a variety of
coating and bonding operations. Also included are a 2" × 10"
piece of 9 oz fiberglass tape (useful for patching, reinforcing
or abrasion resistance), an application brush, mixing stick,
pipe cleaner, two cleaning pads and complete instructions.
The components can be mixed in the disposable package.
101-6 Maxi Repair Pack
The Maxi Repair Pack contains six 105 Resin/205 Hardener
packets, an easy sanding fairing filler for surface filling and a
high-density adhesive filler for bonding. Use the 4" × 12"
piece of 9 oz fiberglass tape for patching holes, reinforcing
joints or providing abrasion resistance to wear surfaces. Also
included are two application brushes, one syringe, two pipe
cleaners, four mixing sticks, one pair of disposable gloves,
four cleaning pads, mixing cups and illustrated instructions.
101-T Six resin/hardener packets only. Each pre-measured
packet contains 16g of 105 Resin and 3.2g of 205 (fast)
Hardener (19.2g or 0.56 fl oz of mixed epoxy).
More information
If you have any questions about selecting or using WEST SYSTEM products that are
not answered in this manual, you are encouraged to contact the Gougeon Brothers technical staff. Call 866-937-8797 toll free or visit,
where you can fill out a form and receive an emailed response to your question.
Specialty Epoxies
G/flex® Epoxy
G/flex Epoxy is a toughened, resilient two-part epoxy engineered for a superior grip to metals, plastics, glass, masonry,
fiberglass, and wet and difficult-to-bond woods. Make structural bonds that absorb the stresses of expansion, contraction, shock and vibration. It has an easy-to-use 1:1 mix ratio
and gives you 46 minute pot life and a long open or working
time of 75 minutes at room temperature. It will reach an initial cure in 3–4 hours and a workable cure in 7–10 hours.
G/flex is available in two consistencies. 650 Epoxy is a versatile easily-modified liquid epoxy. 655 Epoxy Adhesive is a
convenient pre-thickened epoxy.
650-8 Includes 4 fl oz G/flex 650 Resin, 4 fl oz G/flex 650
Hardener (8 fl oz of mixed epoxy), and handling and repair
650-K Kit contains 4 fl oz G/flex 650 Resin, 4 fl oz G/flex 650
Hardener (8 fl oz of mixed epoxy), 2 reusable mixing
stick/applicators, 2 12 cc syringes, 4g of adhesive filler, 4
mixing cups, 1 pair of disposable neoprene gloves, 4 alcohol
cleaning pads, and complete handling and repair instructions.
655-K Kit contains 4.5 fl oz G/flex 655 Resin, 4.5 fl oz G/flex
655 Hardener (9 fl oz mixed epoxy), 2 reusable mixing
stick/applicators, 4 alcohol cleaning pads, 1 pr disposable
neoprene gloves, 10 mixing palettes, and complete handling
and repair instructions.
G/5 Five-Minute Adhesive
An easy to use, fast curing epoxy
system for quick repairs, tooling
and general bonding. May be used
in spot applications to hold parts
in position while standard epoxy
bonds cure. Bonds to wood, fiberglass and metal. One-to-one mixture, no pumps are required. Cures
in 3-5 minutes.
865-4 4 fl oz resin/4 fl oz hardener.
865-16 16 fl oz resin/16 fl oz hardener.
WEST SYSTEM User Manual & Product Guide
Product Guide
Adhesive Fillers
Fairing Fillers
403 Microfibers
407 Low-Density Filler
403 Microfibers, a fine fiber blend, is used as a thickening
additive that builds volume quickly and blends easily to create a multipurpose adhesive, especially for bonding wood.
Epoxy thickened with Microfibers has good gap-filling qualities while retaining excellent wetting/penetrating capability. Cures to an off-white color.
407 Low-Density Filler is a blended microballoon-based
filler used to make fairing putties that are easy to sand or
carve. Reasonably strong on a strength-to-weight basis.
Cures to a dark red/brown color.
404 High-Density Filler
404 High-Density Filler is a thickening additive developed
for maximum physical properties in hardware bonding
where high-cyclic loads are anticipated. It can also be used
for filleting and gap-filling where maximum strength is necessary. Cures to an off-white color.
405 Filleting Blend
This strong, wood-toned filler is good for use in glue joints
and fillets on naturally-finished wood. It mixes easily with
epoxy and has good gap-filling properties. It cures to a dark
brown color, and can be used to modify the color of other
WEST SYSTEM fillers.
406 Colloidal Silica
406 Colloidal Silica is a thickening additive used to control
the viscosity of the epoxy and prevent epoxy runoff in vertical and overhead joints. 406 is a very strong filler that creates
a smooth mixture, ideal for general bonding and filleting. It
is also our most versatile filler. Often used in combination
with other fillers, it can be used to improve the strength,
abrasion resistance, and consistency of fairing compounds,
resulting in a tougher, smoother surface. Cures to an
off-white color.
410 Microlight™
410 Microlight™ is the ideal low-density filler for creating a
light, easily-worked fairing compound especially suited for
fairing large areas. Microlight™ mixes with greater ease than
407 Low-Density Filler or microballoons and is approximately 30% easier to sand. It feathers to a fine edge and is
also more economical for large fairing jobs. Not recommended under dark paint or other surfaces subject to high
temperatures. Cures to a light tan color.
Adhesive Fillers vs. Fairing Fillers
Fillers are used to thicken the basic resin/hardener mixture for specific applications. Each filler possesses a unique set of physical
characteristics, but they can be generally categorized as either Adhesive (high-density) or Fairing (low-density).
Adhesive filler mixtures cure to a strong, hard-to-sand plastic useful in structural applications like bonding, filleting and hardware
Fairing filler mixtures cure to light, easily sandable material that is
generally used for cosmetic or surface applications like shaping,
filling or fairing. Seal all faired surfaces with epoxy before painting.
The Filler Selection Guide on the following page compares the
suitability of fillers for various uses. The Filler Buying Guide
gives package sizes and quantities for various consistencies.
WEST SYSTEM User Manual & Product Guide
Product Guide
Filler Information
Filler Selection Guide
Highest density
Highest strength
Uses—Use description—desired characteristics
(Resin/Hardener mixture thickened with a Filler)
Lowest density
Easiest sanding
High-Density Colloidal Silica
Bonding Hardware—Increased fastener interface and
hardware load capability—maximum strength
Filleting Blend Low-Density
General Bonding—Join parts with epoxy thickened to create
a structural gap filler—strength/gap filling
Bonding with Fillets—Increase joint bonding area and create
a structural brace between parts—smoothness/strength
Laminating—Bond layers of wood strips, veneers, planks,
sheets and cores—gap filling/strength
Fairing—Fill low areas and voids with an easily sanded
surface filler/fairing compound—sandability/gap filling
Filler suitability for various uses HHHH=excellent, HHH=very good, HH=good, H=fair, (no stars)=not recommended.
Selecting Fillers
As a rule, use higher-density fillers when bonding higher-density materials such as hardwoods and metals. Any of the adhesive fillers are suitable for most bonding situations. Your choice
of a filler for general use may be based on the handling characteristics you prefer. Fillers may also be blended to create mixtures with intermediate characteristics.
Filler Buying Guide
Approximate mixed epoxy required to produce a catsup, mayonnaise or peanut butter consistency for the various sized filler
products at 72°F. Mixtures may require more filler/less epoxy at
higher temperatures. See Figure 4 on page 5.
Quantity of mixed epoxy required for
6.0 oz
20.0 oz
20.0 lb
3.8 qt
3.2 gal
48.0 gal
2.5 qt
2.0 gal
32.0 gal
1.0 qt
.9 gal
15.3 gal
15.2 oz
43.0 oz
30.0 lb
1.2 qt
3.6 qt
9.4 gal
.9 qt
2.8 qt
7.4 gal
.7 qt
2.0 qt
5.3 gal
8.0 oz
.9 qt
.7 qt
.6 qt
1.7 oz
5.5 oz
10.0 lb
1.3 qt
1.1 gal
27.0 gal
.9 qt
3.0 qt
16.0 gal
.5 qt
1.7 qt
6.0 gal
4.0 oz
12.0 oz
14.0 lb
.5 qt
1.7 qt
6.0 gal
.4 qt
1.3 qt
4.8 gal
.3 qt
1.0 qt
3.7 gal
2.0 oz
5.0 oz
4.0 lb
1.2 qt
3.0 qt
8.9 gal
.9 qt
2.4 qt
7.2 gal
.7 qt
1.8 qt
5.6 gal
Supplemental epoxy information
Thinning epoxy
There are epoxy-based products specifically designed to penetrate
and reinforce rotted wood. These products, basically an epoxy
thinned with solvents, do a good job of penetrating wood. But the
solvents compromise the strength and moisture barrier properties
of the epoxy. WEST SYSTEM epoxy can be thinned with solvents for
greater penetration, but not without the same compromise in
strength and moisture resistance. Acetone and lacquer thinner
have been used to thin WEST SYSTEM epoxy and duplicate these
penetrating epoxies with about the same effectiveness. If you
chose to thin the epoxy, keep in mind that the strength, especially
compressive strength, and moisture protection of the epoxy are lost
in proportion to the amount of solvent added.
There is a better solution to get good penetration without losing
strength or moisture resistance. We recommend moderate heating
(up to 120°F) of the repair area with a heat gun or heat lamp before
applying epoxy. On contact with the warmed wood, the epoxy will
thin out, penetrating cavities and pores, and will be drawn even
deeper into pores as the wood cools. Although the working life of
the epoxy will be considerably shortened, slower hardeners (206,
207, 209) will have a longer working life and should penetrate more
than 205 Hardener before they begin to gel. When the epoxy cures it
will retain all of its strength and effectiveness as a moisture barrier,
which we feel more than offsets any advantages gained by adding
solvents to the epoxy.
Low temperature considerations
When using WEST SYSTEM Epoxy at low temperatures, special precautions can be taken to assure maximum performance. For detailed information on working with epoxy at low temperatures, refer
to 000-915 Cold Temperature Bonding and Coating with Epoxy,
available from Gougeon Brothers. See page 17 for information on
this and other supplemental WEST SYSTEM publications.
WEST SYSTEM User Manual & Product Guide
Product Guide
420 Aluminum Powder
420 Aluminum Powder will increase the hardness and abrasion resistance of the coated surface and improve its moisture resistance. 420 provides limited protection from ultraviolet light in areas that will not be protected with other
coatings and can be used as a base for subsequent painting.
Cures to a metallic gray color.
Add to mixed resin/hardener at the rate of 10% by volume or
1½ tablespoons per 8 fl oz of epoxy (10 strokes each of resin and
hardener from 300 Mini Pumps deliver 8 fl oz of epoxy). 6 oz of
420 will modify one B group of epoxy. 420-6 6 oz, 420 16 oz.
422 Barrier Coat Additive
A proprietary blend designed to improve cured epoxy’s moisture-exclusion effectiveness. 422 is used as a barrier coating additive to help prevent gelcoat blistering in polyester fiberglass
boat hulls. 422 also increases the epoxy’s abrasion resistance.
Cures to a light gray color.
Add to mixed resin/hardener at the rate of 15 to 20% by volume or 3 tablespoons per 8 fl oz of epoxy. 32 oz of 422 will
modify one B group of epoxy. 422-16 16 oz, 422-48 40 oz.
423 Graphite Powder
Additives for special coating properties
Additives are blended with mixed epoxy to alter the physical properties of epoxy when used as a coating. Additives can be used to alter the color, abrasion resistance or moisture resistance of cured
Color Pigments
WEST SYSTEM pigments are epoxy-based liquid colorants
used to tint the epoxy mixture to provide an even color base
for the final finish system. The colored surfaces also tend to
highlight flaws and imperfections. Cured, pigmented epoxy
surfaces are not a final finish surface, but require an additional paint or UV filter coating for ultraviolet protection.
Add to the mixed resin/hardener at a rate of approximately
one teaspoon of pigment to 8 fl oz of epoxy. More pigment
will increase opaqueness and mixture viscosity. One 4 fl oz
bottle will tint approximately 1½ gal of epoxy.
501 White Pigment 4 fl oz,
503 Gray Pigment 4 fl oz.
423 Graphite Powder is a fine black powder that can be
mixed with WEST SYSTEM epoxy to produce a low-friction
exterior coating with increased scuff resistance and durability. Epoxy/graphite is commonly used as a low-load,
low-speed bearing surface, and as a coating on rudders and
centerboards, or on the bottoms of racing craft that are dry
sailed. It does not provide antifouling qualities. The epoxy/graphite mixture can also be used in teak deck construction to simulate the look of traditional seams and to protect
the epoxy from sunlight. Cures to a black color.
Add to mixed resin/hardener at the rate of 10% by volume or
1½ tablespoons per 8 fl oz of epoxy. 5.7 oz of 423 will modify one B group of epoxy. 423-6 6 oz, 423 12 oz.
Coloring epoxy
For colors other than white or gray, powdered pigments (tempera
paint, colored tile grout, aniline dyes) and universal tinting pigment
can be added to the epoxy mixture. Acrylic paste pigments (available from marine chandleries) are also used to tint the mixture, as
long as they are specified for use with polyester or epoxy resin. 423
Graphite Powder will color the epoxy black or impart darker shades
to colors.
Generally, coloring agents can be added to the mixed epoxy up to
5% by volume with minimal effect on the cured epoxy’s strength.
Always make test samples to check for desired color and opaqueness and for proper cure. None of these coloring additives provide
UV resistance to the cured epoxy, so limit their use to areas not exposed to sunlight unless additional UV protection is applied.
WEST SYSTEM User Manual & Product Guide
Product Guide
Episize™ Reinforcing Materials
Unidirectional Carbon Tapes
737 Biaxial Fabric
Unidirectional 11.1 oz carbon fiber reinforcing tapes are
used for selective reinforcement to improve tensile strength
and stiffness in one direction while adding minimum thickness and weight. Fiber bundles are held in place by a polyester fill thread for easy handling and wet out. 144,000 fibers
per inch of tape width.
702-12 1½" wide × 12' roll, 702-50 1½" wide × 50' roll,
703-12 3" wide × 12' roll, 703-50 3" wide × 50' roll.
17 oz non-woven E glass fabric. Two layers, ±45° fiber orientation. For composites, repairs and reinforcing. Achieves
high fiber-to-resin ratio with hand wet-out.
737-20 50" wide × 20 yd roll.
713 Unidirectional Glass Tape
Unidirectional 11.1 oz E-glass fiber reinforcing tape is used
to add strength in one direction, but with less stiffness than
carbon fiber. Easy to handle and wet out.
713-12 3" wide × 12' roll, 713-50 3" wide × 50' roll.
727 Biaxial Tape
Non-woven 17 oz E glass fabric. Two layers at a ±45° fiber
orientation are held together by a light stitching. Flat,
non-crimped fibers yield reduced print-through and higher
stiffness than woven fabrics. Ideal for repairs, tabbing and
727-10 4" wide × 10' roll, 727-20 4" wide × 20 yd roll.
Glass Tape
Versatile WEST SYSTEM 9 oz woven fabric tapes, with bound
edges, are ideal for reinforcing chines, hull/deck corners and
similar structural applications. When bonded with WEST
SYSTEM epoxy, they provide additional tensile strength to
resist hairline crack development and abrasion.
729-10 2" wide × 10' roll, 729 2" wide × 50 yd roll,
731 3" wide × 50 yd roll,
732-10 4" wide × 10' roll, 732 4" wide × 50 yd roll,
733 6" wide × 50 yd roll.
738 Biaxial Fabric
17 oz non-woven E glass fabric. Two layers, ±45° fiber orientation. The same as 737 fabric with a .75 oz/sq ft mat backing. Approximately 23.8 oz/sq yd total fabric weight.
738-20 50" wide × 20 yd roll.
Glass Fabrics
Woven glass fabrics are ideal for building composite laminates and repairing fiberglass structures. May also be used to
provide an abrasion-resistant covering for wooden structures. When wet-out, the 4 and 6 oz fabrics become transparent, allowing a clear, natural wood finish. Perfect for stripper canoes. May be painted or varnished.
740-10 4 oz– 50" wide × 10 yd roll,
740-20 4 oz– 50" wide × 20 yd roll,
742-10 6 oz– 60" wide × 10 yd roll,
742-20 6 oz– 60" wide × 20 yd roll,
745-10 12 oz– 60" wide × 10 yd roll,
745-20 12 oz– 60" wide × 20 yd roll,
745-30 12 oz– 30" × 30" sheet.
Estimating the number of reinforcing fabric layers
To determine the number of fabric layers required to achieve a
specific laminate thickness, divide the thickness desired by the
Single Layer Thickness of the tape or fabric you intend to use.
Product number
Fabric weight
4 oz 6 oz 11 oz 11 oz 9 oz 12 oz 17 oz 23.8 oz
Single Layer
.008" .010" .012" .015" .017" .020" .035" .042"
*Average of multiple layers applied by hand lay-up
WEST SYSTEM User Manual & Product Guide
Product Guide
Application Tools
800 Roller Covers
Poly Mixing Pots
These thin polyurethane foam covers are the only roller covers recommended for epoxy application. The thin foam allows you to control film thickness, avoid drips and runs and
get a smoother coating. The 7" covers can be cut for smaller
coating areas and narrower roller frames. 800-2 2 ea.
Cured epoxy pops out of these heavy-duty, reusable plastic
mixing pots. Convenient batch sizes for most projects.
805 16 oz pot—1 ea, 806 32 oz pot—1 ea.
807 Syringes
Reusable syringes that can be loaded with epoxy mixture for
injecting into tight spots. Ideal for hardware bonding and
small repairs. Holds 12cc (about 0.4 fl oz).
807-2 2 ea, 807-12 12 ea.
801-HD Roller Frame
Cut into segments for tipping off
freshly applied coats of epoxy.
Cut covers into narrower
widths to coat smaller areas.
3" caged roller frame holds 7" full-width covers and covers
cut to narrower widths. 1 ea.
802 Roller Pan
Heavy duty, flexible plastic roller pan allows you to “pop
out” epoxy after it has cured so the pan can be reused. Eliminates the need for liners. 1 ea.
803 Glue Brushes
Handy, disposable, ½" × 6" glue application brushes with a
metal handle. These brushes are useful in a wide variety of
small bonding and coating applications.
803-12 12 ea, 803-144 144 ea.
804 Reusable Mixing Sticks
A practical mixing, application, filleting, and cleaning tool.
Squared, beveled end reaches mixing pot corners for thorough mixing and blending in fillers and for cleaning up excess epoxy. Use rounded end to shape 38" radius fillets. Cured
epoxy pops off easily, so they can be reused many times.
¾"-wide × 5½". 804-8 8 ea, 804-60 60 ea.
808 Flexible Plastic Spreader
Flexible, reusable 3½"× 6" double-edged spreader for flow
coating, fairing, filling and applying fabrics. 808-2 2 ea,
808-12 12 ea.
809 Notched Spreader
Stiff 4" × 4" plastic spreader with 18", 316" and 14 " notches on
three sides for quickly applying thickened epoxy at a constant rate over large areas. Thin straight edge is ideal for applying layers of reinforcing fabrics. 809 1 ea, 809-2 2 ea.
810 Fillable Caulking Tubes
For use with a standard caulking gun. Great for injecting
large amounts of epoxy, laying a lengthy bead of epoxy or
making fillets. Can be refilled several times, before epoxy begins to cure. Tubes can be refilled again after cured epoxy is
popped out. Holds approximately 10 fl oz.
810-2 2 ea, 810-24 24 ea.
Tool reusability
Epoxy will not bond to many plastic tools because their glossy surface
does not provide enough texture, or tooth, for epoxy to key into. When
cured, flex the tool to loosen epoxy. Thick films pop off easier than thin
films. As a tool gets scuffed and scratched from use, it will become
more difficult to pop the cured epoxy from the surface.
WEST SYSTEM User Manual & Product Guide
Product Guide
Skin Protection
Stay clean and work safely
It is much easier and safer to keep epoxy off your skin than it is to
clean it off. Gloves, coveralls and sleeves help you stay clean.
830 Medicated Skin Cream
Medicated skin cream to soothe minor skin irritations and
help prevent dermatitis. 5 fl oz tube.
831 Protective Skin Cream
A protective barrier cream to help protect skin from irritants. Use with protective gloves. 5 fl oz tube.
832 Disposable Gloves
Lightweight, seamless neoprene gloves are more chemically
resistant than latex gloves. They provide excellent protection while retaining good finger sensitivity and dexterity and
they are more puncture resistant than conventional disposable gloves. Large size fits most.
832-4 4 pr, 832-50 50 pr.
836 Coverall
We’ve used these suits in our shop for many years. Made of
Tyvek™ spun-bonded Olefin™, these suits are inexpensive
enough to be disposable, yet durable enough to be reused
again and again. In medium, large and extra-large.
836-M, L or XL. 1 ea.
838 Sleeves
If you need to cover only your arms, try these convenient
sleeves. Made of Tyvek, 18" sleeves with elastic top and cuff.
Use with coverall and gloves for extra protection.
838-2 2 pr.
Special Cleaners & Tools
860 Aluminum Etch Kit
875 Scarffer™
A two-step treatment for preparation of aluminum surfaces
for bonding with epoxy. Our research shows adhesion to
aluminum is significantly improved with this process. Also
improves paint adhesion.
860-8 two ¼-pint bottles (treats about 50 sq ft),
860 two 1-pint bottles (treats about 200 sq ft).
A unique tool designed by boatbuilders for cutting accurate
scarf joints in plywood up to 38" thick. Attaches easily to most
circular saws and is easily removed. Saw must have a base
plate extension (outside of the blade) ½" or wider. 1 ea (saw
not included).
WEST SYSTEM User Manual & Product Guide
Product Guide
Vacuum Bagging Materials
879 Release Fabric
Economical Release Fabric is a tough, finely woven nylon
fabric treated with a release agent. It is used to separate the
absorber, breather and vacuum bag from the laminate in vacuum bagging operations. Excess epoxy bleeds through and is
peeled from the cured laminate along with the Release Fabric. It’s also used in hand lay-up applications to allow more
squeegee pressure and protect the lay-up from contamination. Peels easily and leaves a smooth textured surface, ready
for bonding or finishing. Not recommended for post-cure
temperatures over 120°F (49°C).
879-2 60" wide × 2 yd roll, 879-10 60" wide × 10 yd roll,
879-18 60" wide × 9" sheet.
881 Breather Fabric
Breather Fabric is a lightweight, polyester blanket that provides excellent air passage within the vacuum envelope while
it absorbs excess epoxy.
881-2 45" wide × 2.7 yd roll, 881-10 45" wide × 10 yd roll.
882 Vacuum Bag Film
Clear, heat-stabilized, modified nylon resin film. Can be
used at temperatures up to 350°F (176°C) for typical composite cure cycle times. A tough, stretchable film for high
vacuum pressures.
882-2 60" wide × 2 yd roll, 882-20 60" wide × 20 yd roll.
883 Vacuum Bag Sealant
Mastic tape sealant for airtight seals between vacuum bags
and molds. Easy to work around difficult angles, patching
small leaks in the vacuum system.
½" wide × 25' roll.
Harness the atmosphere
Vacuum Bagging is a clamping system used for laminating a wide
range of fabrics, core materials and veneers. It uses atmospheric
pressure to deliver firm, even clamping pressure over the entire surface area of a composite part or repair, regardless of the material or
materials being laminated. By laminating over simple molds, composites can be molded into a wide range of functional shapes.
885 Vacuum Bagging Kit
A complete starter kit for room temperature repairs and
small laminating projects up to 13 square feet. Kit includes:
• 885-6 Venturi vacuum generator with Silencer*
(885-7 Silencer also sold separately*)
• 885-3 Vacuum Cups* (3)
• 885-4 ¼" I.D. Vacuum Tubing* (10')
• 885-5 0–30Hg Vacuum Gauge*
• Junction “T” barbs (2)
• Release Fabric (15 sq ft)
• Breather Fabric (15 sq ft)
• Vacuum Bag Film (15 sq ft)
• Vacuum Bag Sealant (25')
• Kit instructions
• 002-150 Vacuum Bagging Techniques (see, page 17)
The 885-6 Vacuum Generator develops over 20 inches Hg
(mercury) of vacuum (10 psi) at .4 SCFM and is designed to
run off of conventional shop air compressors delivering at
least 65 psi at 3.5 SCFM continuously. Some item specifications may vary.
*Available as a replacement part–see price list.
WEST SYSTEM User Manual & Product Guide
Additives, 24
mixing, 4
Adhesion, 6
Adhesive fillers, 22
Adhesive, G/5, 21
Advanced fastener bonding, 8
Alkyd finishes, 13
Aluminum, preparation for bonding, 6
Ambient temperature, 3
Amine blush, preparation for bonding, 6
Application tools, 26
Barrier coat thickness, 12
Barrier coating, 12
Basic fastener bonding, 8
Biaxial tape, fabric, 25
Bonding (gluing), 7
fasteners and hardware, 8
studs, 9
with fillets, 8
Bonding problems, 14
Bottom paints, 13
Carbon fiber, 25
Casting a base, 9
Clamping, 9
Cleanup, 2
Clear wood finishes, 11
Coating coverage, 18
Coatings, types, compatibility, 13
Coloring epoxy, 24
Controlling cure time, 3
Cool conditions, curing in, 3
Crystallization, resin, 19
Cure stages, 3
Cure time, 3
Curing problems, 14
Dispensing, 4
Disposal, 2
Dry method, fabric application, 10
DVD, 17
Enamel, 13
Episize reinforcing materials, 25
Epoxy barrier coating, 12
Epoxy chemistry, 3
Epoxy Hardeners, 19
Epoxy paint, 13
Epoxy Resin, 18
EPOXYWORKS Magazine, 17
Exothermic heat, 3
WARNING!, 2, 4
Fairing, 10
Fairing fillers, 22
Fasteners, bonding, 8
Fiberglass cloth, applying, 10
Fiberglass fabric, estimating, 24
Fiberglass tape, fabric, 25
Fillers, 22
using, 5
Selection Guide, 23
Fillets, 8
Final cure, 3
Final surface preparation, 12
Finish coatings, 13
compatibility, 13
function, 13
Fish-eyeing, 15
Gear Pump, 20
Gel stage, 3
Gelcoat, 13
Getting Started, 16
Gluing, 7
Green stage, 3
Hardeners, 19
Hardener speed, 3
Hardware, bonding, 8
Hardwoods, preparation for bonding, 6
Initial cure, 3
Instructional Publications, 17
Joint strength, 7
Laminating, 7
Latex paints, 13
Lead, preparation for bonding, 6
Linear polyurethane, 13
Low Temperature Considerations, 19
Manuals, 17
Metering pumps, 20
Mini Pumps, 20
Mixing, 4
Model A Metering Pump, 20
MSDS, 17
Open time, 3
Out-gassing, 4
Paints, 13
Pinholes, 4
Plastic, preparation for bonding, 6
Polyester gelcoat, 13
Polyester, preparation for bonding, 6
Polyurethane paint, 13
Porous woods, 6
Pot life, 3
Preparation for bonding, 6
Primary bonding, 6
Primers, 13
Problem solver, 14
Product Selection, 16
Product/Application Overview, 16
Recoating, 12
Reinforcing Materials, 25
Removing fasteners, 9
Removing fiberglass cloth, 5
Repair packs, 21
Resin, 18
Resin-starved joints, 7
Safety, 2
Secondary bonding, 6
Sensitization, 2
Shelf life, 19
Single-step bonding, 7
Solid stage, 3
Steel, preparation for bonding, 6
Storage, epoxy, 19
Structural bonding, 7
Supplemental Publications, 17
Surface preparation, 6
Teak, preparation for bonding, 6
Technical Data, 17
Temperature, adapting to, 3
Thickening epoxy, 5
Threaded rods, bonding, 9
Tip off, 12
Two-step bonding, 7
Unidirectional tape, 25
UV, Ultra Violet protection, 13
Vacuum Bagging Materials, 28
Vacuum bagging, for laminating, 7
Viscosity, 4
Warm conditions, curing in, 3
Wet lay-up time, 3
Wet method, fabric application, 11
Wet-out, 7
Working time, 3
Woven cloth & tape, applying, 10
Dry method, 10
Wet method, 11 n
Build Something
LIBERTY— Hodgdon Yachts, photo—Robert Mitchell
Bow Clock—J.R. Beall
15' Model Battleship NEW JERSEY—Rob Neill
Plywood Vessel—Stephen Gleasner
TENACIOUS—Jubilee Sailing Trust
“Wee Lassie” Canoes—Warren G. Ibaugh
WEST SYSTEM® User Manual & Product Guide
Catalog number 002-950
Gougeon Brothers Inc.
P.O. Box 908
Bay City, MI 48707 USA
©2008 Gougeon Brothers Inc.
WEST SYSTEM is a registered trademark of Gougeon Brothers Inc., Bay City, MI 48707 USA
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