Engine Paint Question

I like to paint engine blocks with PPG. I clean the crap out of the block first, then I like to use Bulldog adhesion promoter. Then a good catalyzed primer, color, and then clear. And as Rani said, just let the primer, flash off before you apply color. Same with the clear coat. That's how I do it, and I've never had issues with paint peeling or cracking off. And always holds up for the life of the engine. But, I'm sure there are more ways then one to do it. ;)