when we preped my sisters civic, we went nice and gental with 270 grit, took us 3 days, 4 hrs times a day. we wetsanded touched up repeated, washed down repeated and right b4 paint we washed use 1000 grit and washed it again but mind u this is for a show car. and what some1 posted thats y they make masks and not those cheap ones from home depot they dont work. my friends body shop uses gas masks but we didnt want to buy em so we took his, and his brain is fine (althought he is a bit strange but he has always been a bit special)