Mine chipped when i was putting the bumper on. I had to tap it in with a piece of 2x4 and a 2lb sledge. I hit the d ring mount and the top corner flaked off. I let it cure in a 78 degree heated garage for over 24 hours. But it appears to be fairly tough otherwise. I can just barley make a indent it in with my finger, hasn't quite been a week yet and seems to be getting harder. Maybe it was just too soon to tap it in, ill place the blame on me for now as i haven't really tested it otherwise.