One thing, and this is very important,
DO NOT clean up the tanks or rivets with MEK! QUOTE]
MEK is one of the best cleaners to use for pro seal. If you read whats in proseal, some of the Mil spec sealants have MEK in them! I work on aircraft for a living and use only MEK to clean metal before proseal application and for clean up and I have never had paint issues with the use of MEK. We actually add MEK to proseal in some instances because it will help thin out the sealant to flow a lot better and it will extend the working time if need be. In over 10 years of resealing windshields, Mooney fuel tanks, and numerous other pro seal adventures, I have never had MEK bubble paint.
SBlack - In my experience Poly-gone does not work the best on certain sealants. The only sealant I have seen it actually work as advertised on was the pink color sealant Piper uses on some models to seal the fuel panels onto the lower wings. The sealant urethane cutters that you can buy that look like they thread onto a 90 degree drill are AMAZING! They cut through sealant like you wouldn't believe. You still have to do some scraping with a plastic scraper (especially around rivet tails) but it will get rid of most of the sealant. I have used these a lot on Citation fuel bays where I was unable to bend my arm to reach with a plastic scraper. If you do purchase these, please beware, they are ment to be used with a slower RPM motor. I believe if you buy the kit that comes with what looks like a 90 degree drill, the motor only spins around 900RPM. If you use them with a regular 90 degree drill it will melt the cutters before cutting through the sealant (ask me how I figured that one out
).