So I finally found a boat that I really like and had actually been looking for. Overall, the boat has had some really nice things done to it, but it had a major blister repair
job done a couple of years ago. I don’t have much info, but I have seen a few pictures. The boat had many large (several inches in diameter it appears) blisters below the waterline. Some of these even appeared to join together. The blisters were ground down to “good” fiberglass, indicating that these were fairly deep, and the hull left to dry for about 6 months. The areas that were ground out were apparently filled by laminating in fiberglass mat using epoxy
resin. The whole bottom was then faired and barrier coated.
job sounds reasonable. However, I am concerned that, due to the size of the blisters and the necessity of laminating in fiberglass mat, the depth of the damage in the laminate is significant, from a structural point of view. I am also concerned that there may be significant hydrolysis and damage of the structural laminate in the rest of the hull that did not show blistering. These areas would now have a barrier coat, but nothing would have been done to address any potential structural issues.
So, if there is anyone on here with some knowledge in this area, I would appreciate any comments on this subject.