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West System Epoxy Resin 105 & Hardeners

West System Epoxy 105 Resin

West System Epoxy 105 Resin


105 Resin is the base material of the WEST SYSTEM family of epoxy products. A clear, pale yellow, low-viscosity liquid epoxy resin, formulated for use with WEST SYSTEM hardeners.

  • Wide cure temperature range with excellent moisture resistance.
  • Wet out and bond on wood fiber, fiberglass, reinforcing fabrics and a variety of metals.
  • Excellent adhesive with or without WEST SYSTEM filler additive
  • No strong solvent odor; safer to work with than polyesters.

Viscosity is approximately 1000 cP (centipoise) at 72°F (22°C).

West System User Manual

West System 205 Fast Hardener

West System 205 Fast 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.

Mix Ratio, Resin:Hardener 5:1*

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)

Pumps required 301, 306 or 309

West System 206 Slow Hardener

West System 206 Slow Hardener


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.

Mix Ratio, Resin:Hardener 5:1*

Pot life at 72°F (22°C) 20 to 25 minutes

Cure to a solid state 9 to 12 hours

Cure to maximum strength 1 to 4 days

Minimum recommended temperature 60°F (16°C)

Pumps required 301, 306 or 309

West System 207 Special Coating Hardener

West System 207 Special Coating Hardener


This hardener was especially developed for use with WEST SYSTEM Brand 105 Resin in coating applications where an exceptionally clear, moisture-resistant, natural wood finish is desired.

Cures to a light amber color, similar to traditional spar varnishes.

An ultraviolet inhibiting additive improves the resistance of a WEST SYSTEM 105/207 mixture to sunlight, but the cured epoxy surface will still require the additional protection of a quality UV-filtering varnish.

207 is designed to self level for smooth finishes, and to wet-out and bond fabrics.

Although it provides good physical properties for general bonding applications, it is more difficult to thicken and less cost effective for this purpose than 205 or 206 Hardeners.

It’s also used for laminating veneers where bleed through at joints may be exposed to sunlight.

Mix Ratio, Resin:Hardener 3:1*

Pot life at 72°F (22°C) 22 to 27 minutes

Cure to a solid state 9 to 12 hours

Cure to maximum strength 4 to 7 days

Minimum recommended temperature 60°F (16°C)

Pumps required 303, 306-3 or 309-3

West System 209 Extra Slow Hardener

West System 209 Extra Slow Hardener


209 Extra Slow Hardener

209 Extra Slow Hardener is formulated for use with WEST SYSTEM Brand 105 Resin 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.

Mix Ratio, Resin:Hardener 3:1*

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)

Pumps required 303, 306-3 or 309-3

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