422 Barrier Coat Additive:A proprietary blend designed to improve the moisture exclusion effectiveness of WEST SYSTEM epoxy.
422 also increases the abrasion resistance and is an excellent additive for providing a barrier coating to help prevent gelcoat blistering.
Add 20 to 25% by weight of 422 to the mixed epoxy.
How much barrier coat to i add to epoxy resin when mixed?
You would add between 20-25% by weight.