Being that car was black that you painted, I will bet it has failed by now. Black will retain much more solvent and it surely delamed. Bob, lol, that brought back a memory. Sad thing is, the building where this happen is gone and MORE friggen apartments are being built! This area is going down the tubes.
Anyway, it was a 69 Mustang and on delivery day, just an hour or so from when the guy was to pick it up I was unmasking a little spot job on the fender and the darn paint (from a previous job) peeled up off the primer. This car had been painted or spoted DOSENS of times, the paint was a foot thick. Anyway, it was out side parked in the sun on a very hot day. I sanded the spot, primed it (lacquer) sanded it, painted it, cleared it, blended it out (all lacquer), AND buffed it in about twenty minutes!!!! No kidding! The metal was hotter than hell and it was dry RIGHT NOW.
I had already told him I never wanted to work on it again unless he was going to have it stripped. So I never did, but did check many months later on that repair when I saw it parked, still looked good. Thank God he garaged it every day.