just make it smooth. Takes forever. Used flat orbital sander, 80,100, 150 then 220 grit. Primed and wet sanded with 400. Each and every little swirl left behind will show like neon so make sure you get it smooth. To the touch is not enough. Prime then shine 500 watt light along the side & look for shadows. And it looks great when done. I don't know if your body shop will paint it though, mine wouldn't unless they did the prep so I did it myself. Sorry no pictures to show.