Additives are blended with mixed epoxy to alter the physical properties of epoxy when used as a coating. WEST SYSTEM additives can be used to alter the color, and to increase the abrasion or moisture resistance of cured epoxy.
421 Fire Retardant
421 Fire Retardant is a hydrated alumina powder that forms a fire retardant mixture for coating in engine room or galley areas.
422 Barrier Coat
422 Barrier Coat Additive is a proprietary blend designed to improve the cured epoxy's moisture exclusion effectiveness.
422 is used as a barrier coating to help prevent gelcoat blistering in polyester fiberglass boat hulls and also increases the epoxy's abrasion resistance.
423 Graphite Powder
423 Graphite Powder is a fine black powder that can be mixed with WEST SYSTEM epoxy to produce a low friction coating with increased scuff resistance and durability.
423 is often used as a low-load, low-speed bearing surface, and as a coating on rudders and centreboards, or on the bottoms of racing craft that are dry sailed. It does not provide antifouling qualities.
501 and 502 Pigments are epoxy-based pastes used to tint the epoxy mixture and provide an even colour base, or to highlight surface flaws and imperfections, prior to the final finish system.
Adding a colouring agent to WEST SYSTEM epoxy is frequently done to make coloured casting, highlight an epoxy coated surface, or to act as a coloured base coat for paint, etc.