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  #1  
Old 11-21-2001
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blisters, boat hull that is

I always haul my boat out in the winter to help prevent blisters. I mentioned this to a boat owner who leaves his in the water. He advise me that fiberglass boats built after a certain year have better quality materials used in them and no longer blister.

Can anyone shed any light on this? If it is true what year did this change take place.
Maybe I can leave mine in the water too.
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Old 11-22-2001
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blisters, boat hull that is

While osmotic blistering can occur on fiberglass boats of any vintage, the worst blistering problems gnerally occur on boats laid up between the mid- 1970''s through the eary 1980''s. The reason generally cited for this period is that resin formulations were altered during the fuel crisises of the 1970''s. You never even heard discussions of this problem until the late 1970''s. But by the early 1980''s the problem was understood and supposedly formulations were changed and barrier coats became more common as well.

This does not mean that you can''t find boats with blisters that were constucted after this period. And there are some manufacturers that do better than others. Some of the French builders, Beneteau and Jeaneau, had a problems with blisters in the late 1980''s and early 1990''s for example.

Jeff

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Old 11-22-2001
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blisters, boat hull that is

The type of blistering I think you are talking about is caused by osmosis..Osmotic blistering.It is caused when water inters through the gelcoat and reacts with the glass resin. It becomes acidic and damages the surface by expanding. It is more likely to occur in warmer water temperatures and on older FRG hulls that were built before barrer coats were sprayed after the gelcoat and before layingup. Check with the construction method of your hull.
JEF
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