Shiny and smooth surface Once a star crack in a windshield is filled with UV-resin and covert with Impact-Filler. A razor blade removes excess material after curing. The surface of the remaining Impact-Filler is then scratched and noticeable from the inside and outside of the vehicle. To get the cured surface shiny again finishing polish is being used to make it a smooth and hard to notice windshield repair again. In order to work clean and efficient we have made the Duobond polishing fluid to adhere very well to glass and so reduces the risk of splashes polish on paint and rubber parts.