My boat had hydrolyzed through 5 layers of mat and roving on the starboard side, 6 feet by 6 feet. It had other smaller and less deep spots also.
did not note anything other than many minor blisters
I ground the whole bottom off, including the gel and mat layer, relaminated the deep spots, and recovered the whole bottom with a layer of cloth and epoxy
. Finished with barrier coat.
5 years later, not a blister and she lives in the water year round.
I read up a lot on osmosis and hydrolyzing of laminates. Most of the misguided info I got was from boat forums
. Some readings and research
into the composite underground storage
tank and piping industry was eye opening. Even many boat yards had uninformed views of the problem. A few yards that specialize in peeling and bottom work seem to be on the same page with each other and seem to agree with outside industries on composite issues.