I always use organisol, other ways will work but nothing beats the real thing. I used black epoxy first then a double coat of organisol and done. It doesn't like being spray in humid weather.

68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram