Clean, clean, and clean again. Multiple thin coats are better than heavy coats. Allow the proper flash time between coats. As I mentioned, I used the Eastwood satin Chassis Black extreme for my topcoat. Supposed to have ceramic in it and it is an epoxy. Went for the extreme for resistance to chemicals. I can tell you this, I spilled quarts of brake fluid in the engine compartment sorting out my new brakes. Had many leaks, many flushes, many spills. Finally got the brakes sorted out and cleaned the engine bay and it looks new. Happy so far but no long term review. Just my humble opinion.
1966 Convertible restomod in progress