A proprietary blend designed to improve cured epoxy’s moisture exclusion effectiveness. Helps to  prevent gelcoat blistering in polyester fiberglass boat bulls. Also, it increases the epoxy’s abrasion resistance. 422 cures to a light gray color.

Add to mixed resin/hardener at the rate of 15 to 20% by volume per 8 fl oz of epoxy. 16 oz can of 422 will modify approximately half a gallon of mixed epoxy.