For a primer, I shot PPG DPLF 90 epoxy primer on mine. Looked good.
Then, I shot PPG DCC9300 with a flattening agent (paint store - $75/quart). The coverage wasn't great so I mixed up some more and reshot. Looked bad, too glossy (maybe due to temperature changes).
I researched this website and alot of folks suggested using Krylon 1613 (WalMart - $2.75 rattle-can) Last night, I scuffed up the PPG paint with a scotchbright pad and sprayed it with the Krylon 1613. Looks GREAT and dried in 10 minutes! Plus, touch-ups can be sprayed anytime.
I'm not a professional painter but I can tell you that going the Krylon route was much easier (no spray equipment to clean up), safer (no iso's) and less expensive. I wish I'd known this before I shelled out the $75...
'68 w/ ps, pb, ac, tic-toc-tac, console gauges, fold-down rear seat, 383ci, 700R4, 8.5" 3.42 posi - restification in progress