
Originally Posted by
JoshMcMadMac
Folks know, but you are asking such an open question that I honestly am concerned that you have bit off more than you can chew from the get-go. You need to sand the whole car, and prime the whole car, to paint the whole car. The grit of sand paper, along with it being wet or dry, is something that comes from opinion, experience, and the current condition of the vehicle. There are countless sources on the internet for this very information that would better serve you than coming to a car-specific enthusiast site.