i just redid mine about 3 weeks back. i sanded down to just the unpainted plastic, did 3 coats of paint and 4 coats of clearcoat. then after it dried, i armoralled the bumper. THEN i dove it, and six 95 mile trips to and from school later its all still black! you cant even see the chips until your face is an inch away, but they are still black so i think all that paint and clear helped