| You have two options depending on how many coats of paint are currently on the car.... If there is three or more coats you should remove some most of the current clear coat so the film thickness doesnt become too much and crack/peal under heat stress. A car with too many layers of paint can be problematic. In this case I would suggest sanding it down with a orbital sander. Start with 220 grit with an interface pad. That will make quick work of the finish. The use of the interface pad is very important. Then take out the 220 sand scratches with a few passes of 320 until you start to see occasional base coat color show up on the pad. Once you begin to see base coat dont sand that area any further. Once you have a nice even 320 grit tooth you can prime, wet sand and prep for paint. I suggest that you degrease the current finish with professional refinishes wax and grease remover before you sand. If the previous paint job involved removing most of the original paint then you can simply wet sand the exiting clear coat with 600. If a two stage urethane clear was used then you can put base coat right over it. No primer is needed if you're not making repairs. If the car had air brush work then a two stage clear probably was used. You can prime in any case but it's not necessary because the urathane clear acts like a urethane primer coat.
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