blistered paint

Question
Hi,
I have some questions for you.  We have a 32 foot sailboat (1974 Ericson) that we repainted five years ago.  At that time it was surveyed and was found to have a dry hull and no gelcoat blisters. Every step was carefully taken in the prep and painting. The paint has held up beautifully despite bumping against docks etc. (We were new at sailing then).  We have had the boat shrunk wrapped in the past, but only to the rub rail.  This year the boat yard wrapped it down over the painted hull.  Now this spring the paint is blistered only where the wrap  was in contact with the hull.   Could this damage have been caused by improper use of the heat gun?  If so, would there have to be burn holes in the shrink wrap in order to do this kind of damage?  There was no blocking or anything to hold the shrink wrap away from the hull.  Or is this just paint failure?  Like I said before there is no blistering anywhere else on the hull. The boatyard is saying that our hull is wet and is the cause for the problem.  The blisters seem to only affect the paint, not the gelcoat. I have pictures but could not attach them to your contact form.  If you e-mail me I can attach them to my reply. How can we determine conclusively the cause? Any information you can give us will be greatly appreciated.

Thank-you,
Dody Marriott  

Answer
Hi Dody

Thank you for selecting this site to present your question. I'd be obliged if you would send the photos so I have a more definite example of the problem. My email address is: [email protected]

When emailing me, please advise the paint product you used, how & where it was applied on the hull, whether it was done inside an enclosed facility or outside, the month this was undertaken, and advise the weather conditions that prevailed during application.

I look forward to your responses, as each question may play an important role when analyzing the evidence.

Safe Boating
Ron