Acrylic laquer is compatable with dope, both butyrate and nitrate. It is not compatable with any enamel. The thinner will soften the enamel and the laquer will dry on top of it. Since the laquer shrinks as it dries the result is a wrinkled mess. I don't know if it is compatable with Krylon or not, but the last time I tried Krylon it dried fast but not as fast as laquer. A general rule of thumb is you can put the slower drying paint on top, but not a faster one, so I doubt it is compatable with Krylon. I wouldn't use laquer on plastic parts except for fiberglass.