Welcome to sailnet.
It would help if you said what kind of boat you have. Most boats, 11 years ago, were not made using any epoxy resin. Also, you wouldn't coat an epoxy boat with vinylester gelcoat, since epoxy is far more osmosis resistant than vinylester resin, and doesn't require it. Most production epoxy boats are painted, not gelcoated.
IMHO, the shipwrights are full of xxxx to put it kindly, as I doubt your boat had epoxy layers applied during the original build, since, as I said previously, most boats were not built with epoxy and vinylester resins, especially not 11 years ago.
Most boats that have vinylester resin are a combination of polyester and vinylester resins, with the exterior layers usually being the more expensive and more osmotic resistant vinylester resin. Epoxy resin was avoided for several reasons, the primary one being cost. It is considerably more expensive than either polyester or vinylester resin. Second, it was generally considered more complicated to laminate with on a production scale, since thicker laminates of it generally require oven curing of some sort to ensure thorough curing.
- Were the blisters wet on the inside?
- How large are they?
- Can you post a photo?
If the blisters are truly osmotic blisters, rather than cosmetic gelcoat voids, then you will need to do a full blister treatment which, in severe cases, can involve removing the gelcoat and outer layer of laminate, allowing the hull to dry out and then replacing the outer laminate and barrier coating with an epoxy of some sort. This is a very expensive and time-consuming process, since drying out the hull can take several months or more depending on the moisture saturation levels.
I would also recommend you read the post in my signature to help you get more out of sailnet.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.