Your technician should discuss with you the adhesive used and the time it takes for it to properly bond the auto glass to your vehicle. This lets you make an informed decision as to when you feel the car is automobile windshield chip repair safe to drive.
Good question. Windshield crack repair equipment varies widely among companies. High quality resins, injections and air removal methods vary from company to company and can affect the finished repair. Quality injection units and high quality resins are as important as the technicians performing the crack repairs. The quality resins create stronger bonds and resist yellowing better than inexpensive resins. Quality injection equipment will remove more air and the injection capabilities provide a higher quality crack repair.
The main question when you are seeking to fix a cracked windshield is whether to replace or repair the glass. Most auto glass shops will opt to repair a crack or chip, as long as it is not directly in front of the driver. They will use a clear resin that is dropped onto the crack and then fixed with an ultra-violet light. The clear resin will then cure and the crack will no longer be visible to the human eye. Most cracks or chips can be effectively fixed in this manner. This method can fix small cracks as well as larger spiderweb style cracks. If an actual hole is formed in the windshield or the crack has traveled too far, your best bet is fix auto glass.
Why do you think there is windshield repair? You got it, cost. Some insurance companies want you to repair rather than replace because of cost. They save a fortune if you repair your windshield. Also, you need to check with your state as to what is legal as far as windshield repair all states have different laws regarding this issue.
If the crack looks exactly the same when completed, it's very likely the technician didn't inject the resin properly. A properly completed repair with cause each area of the damage to disappear from at least from one angle of vision (ex: looking from one side, looking from below, looking from above, etc.).
Thread the repair tube into the suction cup tool since the suction cup is directly over the damaged area. You may need to screw it tightly but don't use any tools, just your hands. The proper alignments of the tools are very essential in repairing windshield, which is why you have to check from inside the car if the rubber is directly on the top of the damage area. Now you have to open up the supper tube and add it to the repair tube. Add drops of repair resin and then put a film underneath the resin and let it dry for ten minutes.