[svxy]

It works on both depending on how sharp the edge is inside your ding. Real sharp edges and broken paint may be to much of a match for a $29.95 body tool. There was on sharp edge ding I had from a tree limb I was sure it wouldn't get out, but it pulled 90% of it out and then a little rubbing compound it made it look a lot better. Common sense tells you that this is not a miracle worker, but it does work.
On that tree limb ding, I'm not totally done with it. I'm going to try again and get a little creative with the hot glue.