Wooden Boat Restoration Repair - WEST SYSTEM Epoxy

206 Slow Hardener ® —Used for general bonding, barrier coating and fabric application.
Formulated for a longer working and cure time or to provide adequate working
time at higher temperatures. 5:1 mix ratio.
Note: 205 Fast and 206 Slow Hardener may be blended for intermediate cure times.
Always maintain the proper 5 part resin to 1 part hardener ratio. Do not mix 205 or
206 (5-to-1 ratio) Hardeners with 207 or 209 (3-to-1 ratio) Hardeners.
209 Extra Slow Hardener— Used for general bonding, barrier coating and fabric application
in extremely warm and/or humid conditions. Provides approximately twice
the pot life and working time as 206 Slow Hardener and adequate pot life up to 110°F
(43°C). Also used at room temperatures when a long pot life and working time are
required. 3:1 mix ratio.
207 Special Clear Hardener—Formulated specifically for barrier coating and fabric
application where clear finish is desired. 207 has a low-viscosity for good fabric wet
out. 207 contains a UV stabilization additive, but still requires long term UV protection
with paint or varnish. 207 provides a blush-free coating with good physical properties
for bonding. 3:1 mix ratio.
Hardener Selection Guide
HARDENER RESIN/HARDENER USE
205
206
209
207
Fast cure—General bonding, fabric
application and barrier coating
Slow cure—General bonding, fabric
application and barrier coating
Extra Slow cure—General bonding,
fabric application and barrier coating
Clear fabric application and coating,
natural wood finish
8.2.2 Specialty Epoxies
Using WEST SYSTEM Epoxy 57
HARDENER TEMPERATURE RANGE (°F)* CURE SPEEDS at room temperature*
40° 50°
Room Temp.
60° 70° 80° 90° 100°
POT LIFE
100g cupful
9–12
minutes
20–25
minutes
40–50
minutes
20–26
minutes
OPEN TIME
thin film
60–70
minutes
90–110
minutes
3–4
hours
100–120
minutes
CURE TO
SOLID
thin film
6–8
hours
10–15
hours
20–24
hours
10–15
hours
*Epoxy cures faster in warmer temperatures and in thicker applications—Epoxy cures slower in cooler temperatures and in thinner applications.
Figure 8-1 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 working.
G/flex Epoxies
G/flex Epoxy is a toughened, resilient two-part epoxy engineered to absorb the stresses
of expansion, contraction, shock and vibration. It has excellent adhesion to metals, plastics,
glass, fiberglass, and wet and difficult-to-bond woods. G/flex is more suitable than
105 Resin-based epoxy for bonding thicker, less dimensionally stable framing members.
A 1:1 mix ratio gives you 46 minute pot life and a working time of 75 minutes at 72°F. It
reaches 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.
Six10 Epoxy Adhesive
Six10 is a two-part thickened epoxy adhesive in a convenient, self-metering cartridge,
designed for permanent, waterproof, structural gap-filling and gluing. Six10 Bonds to
wood, fiberglass, metals and masonry. With the included 600 Static Mixer attached,
fully mixed adhesive can be dispensed in a continuous bead or into tight spaces using a
standard caulking gun. Working time is 42 minutes at 72°F. It cures to a solid in 5–6
hours and takes high loads in 24 hours.
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