I've used single stage and BC/CC on lots of engines and transmissions. Big thing on getting it to stick is like painting anything else, the parts must be super clean and shot with a epoxy primer first. If you want to get fancy, get out the die grinder, the 5" grinder, and the 5" sander and do some de-burring and casting flash removal--really enhances the final look. Seems to stay on just as well or better then the engine paint in a rattle can....