It will stay on the block good with epoxy, I use the same, Is your urethane the same as our 2 pack ??? different terminology here, our 2pack is paint plus hardener usually 2 to 1 mix



Quote Originally Posted by DA34GUY View Post
Make sure the block is clean, shoot epoxy primer,scuff then shoot S/S urethane (3 coats)
have seen engines I've done this way 7-8 years later and they still look new.
Good luck