Unfortunately, blisters are a common ailment of fiberglass boats that are left in the water all the time. Warm fresh water seems to be worse than cold/salt water. The cause is basically the result of the resin used in the fiberglass being just a bit porous and allowing water to penetrate and sit. There appear to be many factors that contribute to the problem and unfortunately there are no good cures. The bottom line is that one hull can be immune while another will suffer from it. Even from the same manufacturer. The bad news is that if you have some now, you will have more next year. And more the year after that. And the ones you have now will get bigger. If you keep a bottom paint on the hull to fight the growth then the blisters are not that terrible a thing. You grind them down and patch, paint covers it. If you want to keep the hull bright and shiny then you are pretty much screwed..... Rod
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