Reduces water absorption in fiberglass hulls. Prevents osmotic blistering. Heavy duty high build two-component epoxy-polyimide coating. Use where maximum resistance to fresh or salt water is required. Complete coating system is resistant to water many industrial fumes and very humid conditions. Excellent durability.
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The last step in the gelcoat blister repair system is the application of the final barrier, Pettit 4700/4701 High Build Epoxy Primer over the sealed and faired fiberglass laminate. For prevention of osmosis on new or unblistered hulls, the removal of the gelcoat, sealing and fairing is not required, and therefore application of the High Build Epoxy Primer is the first step. Regardless of which system you require, the application of the final epoxy barrier will be the same. Multiple coats are required (usually 2 or 3) until a dry film thickness of 18 mils (eighteen thousandths of an inch) is reached. Each coat may be applied in succession after the preceding coat has cured to a gel stage. After the final coat has reached the gel stage, the antifouling paint may be applied. Following this procedure will eliminate the need for sanding between coats, greatly reducing time and labor.
