Disclaimer:
I am by no means a professional painter. Yes, I painted 2 cars in my garage without blowing up the house and the cars turned out great. I made $$ out of them.
What I would like to share is what I remembered when reading a painter's book: "The paint actually does not dry.....and it should not. If it dries, it becomes dull. Thus, the other purpose of 'waxing cars' is to supplement to oil that the paint needs to remain wet. Keeping the paint 'oiled/wet' makes it shine."
This info/theory blows me away up to today. It is similar to welding: Do you guys know that metal actually evaporates?