Like was said previously, it's better than nothing and they do little to no prep work. I had an '86 Camaro I picked up the day it got out of the Maaco booth. The guy I got it from did some prep work, so it looked pretty good. I sold it 4 years later and it still looked ok. It started to fade, but a good wax was able to bring back the shine. Only real issue I had was some chipping around the spoiler, but it really wasn't that noticeable. IMHO it's better than running around with mismatched panels until you can save up for a quality paint job on a dd, but if it's for a project, don't do it.