Frets24,

My guess is, your issue begins with the resin application.

Look for the largest blister and cut it away and remove the material. The tell, will be the color of the inside. Simply put, that blister ain't sticking!

58 years of model building and 40 years of using Automotive paint products and I've never had a blister on anything I've ever painted.

Also, once a model is glassed using quality resin and cloth, ANY chemical can be used as a cleaning agent, as long as it doesn't attack the surface resin.

I use and will continue to use only Polyester resins. In fact, I went on line looking today. One gallon with hardener for 33.00. This IS professional stuff, not consumer grade. And it ain't West.