I use Upol automotive clear, Model masters Ultra-Gloss Clear, and Testors Wet-Look Clear in that order based on availability. I will also use Spraymax 2K clear when I have a fair amount of bodies to clear at one time.
I just got a really clean buildup of a '74 Pinto from Kelli Khrome; I'll post pics later. It's missing a grille but all else is intact. I think I can shove a 5.0 engine in it. Lol.