OK, working on painting my manifold cover. I washed and dried the original paint. Scuffed it lightly, then primed it with a primer for plastic. After that dried, I lightly sanded the primer with 1000-grit. Cleaned the surface with plain water, clean rag, then blew it off with compressed air.
Set the part in the box, shook the hell out of my new can of DupliColor, and began spraying. This happened INSTANTLY.
So, what happened, and why? Also, what can I do to fix it?