I use rage ultra, was hard to pay 30 plus more on a gallon compared to what I used to spend... but the time it saves in sanding is more than worth it.

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