[jamis]

I dont think they make a two part epoxy paint that is high temp. I have always just gotten all the oil off and shoot with high temp paint only, because I never seen high temp primer. I have done some with zinc-cromate primer and imron, but that just starts to burn off after a while. especially near the head/exhuast ports.

Im with meathead, just wash it off, let it dry for a couple of ours to make sure a the humidity is gone from the cast iron and spray bomb. You will know when you have all the oil off the engine it should start to surface rust within a few hours.