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<< as far as prepping, would you need to sand the car all the way down to the metal? Or just lightly sand it to get the finish even? >>
It depends. What is causing your car's finish to be unsightly? Is it rust, dents, scratches, swirls, haze, cracking of the finish, etc? And, do any of those things involve layers of finish that are deeper than the base coat? If it does, then how extensive is it?
If we are just talking defects in the finish (the paint itself) like old and weathered paint, and it involves nothing deeper than the base coat, you can just knock the clear coat off to expose the base coat. They'll shoot one additional coat of color then finish with a new clear. The great thing about clear coats is that your base coat can have many irregularities that won't show after the clear is applied. That's why they can do these cars and make them look so well. >>
Thanks for the reply tcsenter. I'll give you a little more information:
My 92 civic's grey-black paint is pretty much shot all over. Dull a little all over, but many, many, light scratches and swirl marks. Very few scratches penetrate deep down except for one long one on the hood, a 12" "keying" scratch, and a 4" 1/3" deep gouge on my rear bumper. Like most hondas of this vintage, there is minor rust by the wheelwells. I was hoping I could buy a power sander, lightly sand the whole body (clearcoat like you said). Also, I planned to flake off the rust, sand it down, and add some compound to fill it back in (is that what bondo is for? I also planned to do the same for the gouge on the bumper-just fill it in with a little compound or whatever is needed. I planned to have them go over it with a black paint, probably not exactly the same color (as I somewhat dislike the "light" black current paint, planned to get a "jet black" paint.).
It sounds like this would work but anyone with pointers would be helpful. I'll wash my car tommorow and take a few pictures to illustrate the condition.