West 422 Barrier Coat Additive 16 Ounce 422-16
Additives are blended with mixed epoxy to alter the physical properties of the epoxy when used as a coating. Additives can be used to alter the color, abrasion resistance or moisture resistance of cured epoxy.
A proprietary blend designed to improve cured epoxy's moisture-exclusion effectiveness, West System 422 is used as a barrier coating additive to help prevent gelcoat blistering in polyester fiberglass boat hulls. West 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.
Sixteen ounce can of West 422 will modify approximately half a gallon of epoxy.
West System User Manual 2015
West 422 MSDS