On Thursday, April 7, 2011 11:00:12 AM UTC-7, wrote:
This agrees with my experience also.
Usually blisters are where moisture is trapped for a long time.

I've had a few blisters form on the fuselage of my previous glider after I had done some wet sanding in the cradle and didn't realize some water had seeped into the carpet. A month later, I put the ship together, and had to do a bit more wet sanding after repairing the blisters.

That's why I'm very careful to dry the ship when putting it away in the rain, then double check all contact areas ASAP after it's stopped raining.

-Tom