I just bought a 1991 Beneteau 41s5 sloop. It has about 100 blisters mostly just above the keel on the hull they are about 3/4 to 1 1/4 dia and 1/16 to 3/16 high. A complete removal of all bottom paint and adding a barrier coat plus repairing the blisters is very expensive-- however it is time for a bottom job but I dont want to spend $8000 for everything. A knowledgeable friend says that a barrier coat may not solve the problem because the blisters may be from air bubbles entrapped during layup and not osmosis or irregular mix of the polyester material. If that is true then a barrier coat will not solve the blister problem. Plaese advise --Thanks Make that 300 blisters!
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