I now use a small piece of plywood with a towel under it with no problems. I originally tried to walk and kneel on it without distributing my weight (before I found this forum), and now have several small dimples up there, I think were left when I knelt as the knee does not distribute the weight as much as a foot. Other than not looking the best, there is no lasting problems with these dimples. If you use a ladder up against the side instead of a step ladder, pad the area where the ladder hits the edge, or you could rub the paint off there also.....another lesson learned.
Chap