What are the repair methods for cracked car windshields?
2 Answers
Car windshield crack repair methods vary depending on the severity of the crack: 1. For minor cracks, specialized glass repair agents can be used to fill them without affecting the original glass structure and function; 2. For longer cracks, the windshield needs to be replaced. The windshield replacement method is as follows: 1. Use a screwdriver to remove the black protective strips around the windshield; 2. Use steel wire to pull apart the sealant around the entire windshield; 3. Use a small blade to scrape off the black sealant remaining on the car; 4. Apply polyurethane sealant to the windshield frame; 5. Install the windshield.
Last time my windshield got a coin-sized crack from a small stone, so I bought a repair kit to fix it myself. First, I thoroughly cleaned the dust from the crack, then slowly injected special resin glue into it using a syringe, making sure to completely fill the gap. Next, I used a UV lamp to repeatedly irradiate the area for 20 minutes to harden the glue, and finally scraped off the excess glue and polished it. The whole process requires great skill, and the key is to ensure no air bubbles remain. If the crack is over ten centimeters or located at the edge, this kind of repair isn't very stable, as the glass is prone to cracking under stress. After repair, the glass strength can recover about 80%, but it's best not to use hot water to melt ice in winter, as sudden temperature changes can make the repaired area more fragile.
