Just get the 3M kit and quit playing around. It has several grades of abrasive, round drill head and masking tape. There are plenty of headlights that you can't get to with a ball (I've tried, I have 5 of them) and if you do use it could rub off the paint adjoining, or simply not get to the edges. Flitz works as a polish as long as you can get to the lens. I'm now using headlight polish that supposedly has UV retardant in it but grinds as good as Flitz