1966 Dart GT-it begins

While waiting for the new fuel system parts I am doing so prep and prevention. Picture is not the end just a part in the process. There were a couple flaws in the factory undercoat and probably rock chips that cracked it. So to seal up I am removing it taking metal down bare.

Thought is to use a rattle can like Eastwood Epoxy primer then spay can undercoat to feather/blend to the OEM undercoat. Does this sound right?

Of other product , method suggestions.