Our windscreen crack repair kit contains polyurethane and silane coupling agents. It can quickly penetrate glass cracks and repair the glass surface in a short time. The method of its use is simple: first clean and dry the damaged area of the windshield then squeeze the windshield repair fluid into the crack glue it to the curing film cure quickly in the sun for 5 minutes and then clean the surface with a scraper. And after repair the glass is as transparent as before improving the visibility of driving.