From the first giant repair machine, originally introduced by 3M, to a myriad of equipment and companies that specialize in all aspects of glass repair, the search to find the right repair guy has become quite a challenge for “Joe” consumer. Poor quality repairs can happen even when the most experienced repair person is at the helm. Windshield glass is layered like a sandwich, and it’s the outer layer of glass that receives all the activity from the harsh road environment. The poly layer in the middle flexes and holds the inner and outer layers of glass together so splintering is reduced and strength is added to the vehicle’s roof. As with all science and technology, improvements in the glass repair business have improved drastically in recent years. Auto glass repair shops and mobile service providers must now make the choice between using the old way or changing to the new superior technology for their customers. Ultimately consumers must know a little about the repair systems themselves in order to receive the best service for their money. The technician loads the liquid resin into the barrel of the injector after mounting it onto the windshield by way of the bridge. The bridge is the thing with the suction cups that stick to the windshield. The resin sits on the bottom of the injector that is sealed to the windshield surface and an o-ring seals the resin in the injector barrel. Then a vacuum is produced by pulling up a plunger at the top of the injector, you’ve seen this before more than likely. The air contaminate, that is trapped within the broken glass, now must be pulled out of the damage and up through the liquid resin. Problems arise from air bubbles that are left behind in the damaged area. Some air bubbles can stay in the liquid resin, not being pulled completely through to the top, and when the injection starts with the downward motion of the plunger, the bubbles are pushed back into the glass. The air bubbles push the resin aside and produce voids in the repair that look unsightly and produce weak repairs.