I have a 12' x 50' Catamaran Cruiser Houseboat, probably best described as a
"camper" or "trailer" sitting on catamarans. Guess you might call it a
"poor mans houseboat" as it's not in the same league as the fancy $250k
jobs.... but suits our purpose beautifully, and we LOVE it.

I was told when we first put it in the water to watch for "blisters" in the
fiberglass hull a few years down the road. Well... here I am a few years
down the road (3 years to be exact), and I DO see some half-dollar sized
places on the hull that must be the aforementioned blisters (3 or 4 down
each catamaran). Nice, smooth bulges about 1.5" in diameter that protrude
about 1/8" off the surface of the hull, almost looks as if there was a
carriage bold head under there that was glassed over.

Is this "blisters"?

What to do? Is this something I could fix myself, or does it need
"professional" work?

Some have said painting the glass hull with an anti-fouling paint will help
prevent this, but I didn't think painting a glass hull was a common
practice.

Any and all suggestions are greatly appreciated.

Thanks in advance...

cricketman