West System 422 Barrier Coat Additive - 500g

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. 
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 weight, 3 tablespoons per 8 fl. oz. epoxy (approximately 32 oz. per B group).