all about prep. sand off the crap paint unless its a good base and just sand it with 600 grit. If ya gotta start from the base then use the primer from napa, its the same stuff as i believe 2k primer they have for paint guns. Either way its great primer not the cheap rattle can shit by rustoleum or whatever. Let that cure fully. then sand 600grit. Spray your color, give about 10-15 min between each coat to let it tack up but not dry. spray about 3-4 coats of color, just depends on the wetness of your coats. Now on the last coat of color wait a little longer then spray your clear. 4-5 coats should be fine. There a rattle can of the professional clear out now. has a vile of hardener in it you puncture before spraying. The rule is spray one more coat than you want for clear, then when its dry you buff/polish/wax it. If you let coats dry you have to wet sand before spraying another. And remember to use a cleaning solvent to remove dirt/grease/etc before you spray a coat- unless of course the paint is still wet.