My buddy the body man wanted to pain his land rover but didn't feel like spending money on good paint for a woods beater. I suggested trying Rustoleum, to which he looked at me in disbelief.
Well, $20 later, he shot some black satin through his HVLP gun, thinned at like 5:1 with Acetone and it looks pretty darn good after a single coat and basically zero prep.
I'm convinced with some prep and setup and plenty of time color sanding you could get it to look real good for real cheap.