1964 Valiant "Get Runnin & Drivin"
Rustoleum Industrial call for acetone as a reducer for spraying. And even with acetone, the stuff dries S-L-O-W.
Maybe a pro bodyman reading will chime in. Back a decades a go I built a lot of cars, and had 2 country bodyshops, that did most of them. One guy did it all, chopped, weld, fab, paint, he told me he used a slower reducer than what would be recommended, we used acrylic urethane. It gave it a wetter look and better shine. I have done the same but I have no idea if it really matters that much or at all??
I figure if JD uses Rustoeum to paint $100,000 tractors they have a good method with it.
I like the old school look of acrylic urethane vs bc/cc. I simply order my top coats and many primers from a and TCP Global. They use old formular PPG and match the old charts no problem,. .. After I spent all that time cutting, welding, sanding, blocking, a couple more $ in materials is not bad for me.
Probably the big thing is if a car can sit under a roof and out of the UV.