EXIT1965 - i agree, maybe it is a 50/50 problem with the prep and the difference in the paint. when i prep i use about a 200 and then start painting, but i allways clean the surface very well. i use the mineral spirits because i know it won't react with the paint, and it is a very good cleaner. people use mineral spirits to clean carb parts, as it does'nt eat at rubber, and i find it a excellent solvent for cleaning grease, oil, ect....it even works really well on removing overspray on chrome and lenses without damaging lenses. it's funny that at walmart they sell rustoleum and tremclad. i'm almost tempted to get some and test it. but like i said surface prep plays a huge role in adhesion. but also enamels take long to dry, as was the case for all my cars, i'd say about 4 months and it is totally and safely cured. i'd bet my paint would scratch off also, i just never tried since it was not a "test".