Originally Posted by corbett_auto
He is right....
But...if you do not break through the current finish on the truck there is no reason to have to put anything on top of the primer. Just scuff whats there and spray it down. Eventually the UV rays will break down the primer, but if you get 2 good coats of a quality Epoxy you should be fine for a few years. If you want to have it last longer just apply a matte clear. Or you could have a paint shop mix up some grey paint with a flattening agent in it to dull it out.
for something that is going to last, and look good after a year in the sun and rain, wouldn't he want something that is meant to be a finish coat, and just use a flattening agent like you said? I would think even with 2 good coats of primer, it would be hard to keep clean. wouldn't dirt and bugs and such be more difficult to get off? not exactly my field of expertise, just thinking out loud. (sorry hobo)
also saw this stuff
at Eastwood, not cheap, but maybe a better option.