It all depends how much paint there is to sand. So be careful because maaco might not have put that much paint down. I have done it before and its turned out quite well. Just gotta have patience. you MUST have a sanding pad or block or else you'll get burns all over the place 1500-2000 will work. But remember your final result wont be shiny. it'll just be smooth. It has to be buffed w/ compound and polish before you get a glassy finish. You can also burn through paint w/ the buffer