So I'm gonna get a cut polish done. I bought a red car...had no idea the upkeep needed for this color and things didn't go so well. But beyond my control, it has a few scratches and chips from the previous owner. What can I do to prep the vehicle such as paint filler before it goes in for the polish. Any particular produts? I've seen a small meguirs spot sander before but not sure how it's used...