When it comes to windshield repair, a professional shop will use a stronger, higher-quality resin than what you can find in DIY kits. If done correctly, these repairs can last the life of your vehicle's windshield. The shelf life of the resin depends on the size of the bottle and how it is stored. It's best to keep the resin in smaller bottles of 7 to 15 ml, away from direct sunlight, and at room temperature.
This way, the resin can last for a couple of years. Most professional shops put a Julian date on their resin and offer a 1-year warranty. When a windshield repair is performed, a small amount of clear resin is injected into the chip, crack, or star. This helps prevent further cracking by filling in the damage, but it doesn't hide or conceal it. If the damage is in your line of sight while driving, you'll need to replace your windshield.
Successful windshield repair requires not only high-quality resin but also enough time for it to cure properly. Cheap resins don't restore the strength of car glass after repair. For surface cracks, the resin must be able to contract by no more than 1 to 2% and remain in place after curing - like with Ultra Bond crack-repairing resins. The best way to repair cracks up to 24 inches is to use car resins or a double injector for very long cracks. Professionals use the windshield resin method to repair chips and cracks in car window glass.