When I finish a windshield repair it looks great but later it seems to reappear. What is happening?
A1: There are two main reasons for this problem, the most common of which is overheating. While warming the glass to 80 or 90 degrees can be very beneficial, heating the glass past that point causes the glass to expand, pushing the windshield repair resin out of the crack. It looks repaired initially, but in fact has no resin in the cracks, thus no bonding strength. When the glass is cooled it contracts and the cracks reappear. To test this theory, heat a rock chip on a piece of scrap glass without putting any windshield repair resin in it. Small chips and cracks will often disappear. Now cool the glass and see what happens. A2: The second most common reason for this problem is putting too much pressure on the windshield when affixing the windshield repair bridge and injector to the windshield. If the windshield repair injector is over-tightened, the glass will flex in and the cracks will close just as when overheated. To eliminate this problem, once the injector seal has made contact
