Join Date: Feb 2010
Location: Narragansett Bay
Thanked 576 Times in 552 Posts
Rep Power: 11
Re: Fiberglass checks
Maybe it's the resolution but I can't see blisters in those photographs. Are you certain that's what they are? If that hull was "sand" blasted, it was either a very poor job or it may have actually created the damage you're seeing. I still see patches of color, which I assume are either barrier or antifoulant. The brownish color is what? Did they tear the gelcoat off? No one actually uses sand on fiberglass, it's typically soda or some other softer media. Sometimes ground nut shells.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.