Almost all rock chips and cracks can be repaired. Allowing safe driving behind the repaired windshield is the number one goal of windshield repair tech. The second goal is to prevent further cracking and to reduce glare that distracts the driver and creates safety issues.Checkout Windshield Replacement for more info.
Windshield repair is inexpensive compared to windshield replacement. Repair eliminates problems associated with replacement such as leaking, wind whistle or windshield failure due to airbag deployment. This can and always has been a real problem when windshields are not installed to original equipment manufacture Specifications by trained windshield replacement technicians.
Windshield chip and crack repair technicians need training to perform quality repairs that look good and make the windshield safe again by returning structural integrity. Some windshield repairs look bad and should be scrutinized as possible windshield failure or cracking could occur and require replacement of the windshield. Bad repairs are common when improper techniques are used.
Anyone can put a drop of resin on a chipped windshield and call it repaired. Improper repairs such as dropping resin, will almost always fail. Proper technique requires removal of moisture and air that entered the chip/crack upon impact or over time. Removal of moisture and air requires that the chip/crack be put in a vacuum to remove air and moisture, This requires specialized windshield repair equipment such as injectors capable of applying a strong vacuum for this purpose and able to inject windshield resin properly for a complete repair.
Proper windshield repair takes a little time. First the injector/vacuum unit must be properly placed over the chip/crack. By placing the unit in vacuum mode the moisture and air can be removed from the chip/crack. Setup procedures and vacuum stages take about 10 minutes each unless lots of moisture remains in the crack where upon requiring the heating of the windshield glass to the proper temperature to vaporize the moisture. This allows the vacuum to remove any remaining water vapor. (This can take up to 20 minutes.)
Second the injector must now be prepared to inject the resin into the chip/crack to begin the windshield repair. The injector needs to be placed in injection mode and then cycled between injection mode and vacuum mode until resin fills the chip/crack completely.
Third after resin injection is complete a Plastic Mylar cover patch is applied with pit filler if needed.
Forth curing is required to harden the resin. The time it takes will vary depending on temperature and normally will take about 5 to 7 minutes and then excess resin is removed using a razor blade and the area is polished to optical quality.
At this point if the repair is done properly all is good if not done properly you are stuck with a big problem as once the windshield has been repaired you can’t fix that same spot again. Repairs must be done right the first time. With proper care you will never have any issues with that repair spot again.