When I first did it I wet sanded with 1000, 1500, then 2000 grit after the sixth coat but the 1000 cut too fast and cut through some layers of paint. When I buffed it out it left little shiny rings from the paint being shiny under the top layer. So I wet sanded it with 600 then did 2 more coats then wet sanded with 600 again then did one more single coat then went to 2000. To answer Bakaryu other question mix the paint real thin until it is just like water and you will not have hardly any orange peel or buubbles.