I am going to ask the same question as tom... so. Usualy leaving a plane in the car, even only say for a day, in high heat will make your covering bubble up. My whenever planes that I kept in my car would get this really bad. Easy remedy is my heat gun and covering iron. Heat gun is fine for planes that use mainly just one scheme. Be more careful with the multi colored planes and either take your time with your heat gun, or just use the iron mainly and heat gun for trouble spots. I found that using a combination of the heat gun and my iron makes things go bye really fast

Of course you could just get Tom's composite he is comming out with or a composite ARF and not worry about the bubbles