Thanks guys, I never thought about the propellant thing, I've been a painter of full size cars since '67, & though I'd seen about everything there was to see,. I have had problems on a full size Cadillac with cratering due to solvent popping due to too much material & the top coat sealing before it could gas out enough, but that looked like tiny fish eye in the finish. On the subject of covering fish eye if you do get it, it will cover much easier if you just mist on a couple of coats until the paint sticks, then lay on your heavy coat to flow the finish out.