be very careful with a da it takes nothing to remove a corner or body line also will create wavyness if you dont hold it flat to the piece i recomend hand doing all of your curves start with 180 to remove the bulk then 220 to get out the 180 scratchs do the whole thing in 400 prime sand it with 800 wet basecoat and clear sand with 1500 and 2000 wet buff it out and you will have a show flat finish.