I have hull #6 1996 and initially, we had several small blisters just under the antifouling paint which I think was due to improperly cleaning the hull after it came out of the mold.
About 5 years ago I had the bottom paint stripped and an epoxy barrier coat applied and since then there has been no problems. Except for the keel where it seemed almost impossible to keep paint on it. It has been stripped and barrier coated but peeling down to the lead still occurs in spots. I almost think it is a case of stray currents somehow affecting the paint adherence. It was very bad in salt water and while using a high wattage inverter for long periods. Now that the boat is back in fresh water and no long term use of the inverter, the problem is much abated.
The hull blisters we had were very shallow and about the size of a pencil eraser and grouped in circles and along the centerline of the bottom. Also they occurred around the thru hulls. After I sanded down to the gel coat and repainted they have not reappeared.
Bill Stellin Jaywalker
Date: Mon, 25 Jan 2010 06:49:05 +0000
Subject: [j4x-owners-group] Blisters on J-42's?
I'm curious if anyone has noticed any hull blistering on the older J-42's? The vinylester layer was intended to prevent blistering and the hulls were guaranteed for 10 years. So the question is, have any hulls >10 years old begun to develop any blisters?