New forum group, Nor-Cal Mopars

Yea you can do it that way just be careful like you said of heating up the panels and distorting the metal. You can also DA it with 80 grit paper down to bare metal and then prime it. If you have a compressor you could almost buy a cheap harbor freight gun 29.00 and a gallon of epoxy primer for the same price as 12-15 cans of spray paint. You will get way better coverage, better protection and it won't look half bad. Rattle can wont cover as good and will be splotchy. It's your call but that's the way I'd do it.