you are supposed to sand the entire car.. well put it this way my color is called blaze crystal red pearl.. and then we added a little bit of red pearl.. with base, clear reducer, hardener, enhancer, and house of kolor pearl. i had 550 in paint and that was at cost paint is not cheap.. also if you are at all picky put out the extra cash and pay someone to do it.. the money , time, effort, aggrovation, and feeling of dispare you have when you realize that its gona cost you more to pay someone to fix your f -up plus all the money u put out to f- it up yourself