It depends whether or not your doing the door jambs, engine bay, trunk area, etc. A basic job, a gallon and a half should do, but definately buy more paint than you need, because if you run out in the middle of the paint job you'll be in trouble. Also you can use the extra for touch ups down the line, also you don't to worry about the paint store mixing the paint alittle different when you go back for more. Good luck with you paint job.