Is Crack Repair Glue Effective for Headlights?
2 Answers
Headlight crack repair glue is not effective. Due to flying stones or scratches during driving, car headlights may develop scratches, and minor scratches can be repaired. Repair methods: Toothpaste Polishing: For fine scratches on car headlights, toothpaste can be used for polishing. Toothpaste contains abrasive particles. Apply toothpaste to the headlight, then use a clean towel to polish in circular motions before rinsing with water. Toothpaste is somewhat effective for minor scratches but has little effect on larger ones. Polishing Repair: For longer scratches and cracks on car headlights, fine-grit sandpaper can be used for sanding, followed by polishing with polishing wax. The principle is similar to paint polishing. Fumigation Repair: This method uses a heater with alcohol as a volatilizer. Specialized and processed materials are then attached to the headlight surface via steam to fill in the scratches, followed by sanding to achieve the repair effect. This method is equivalent to coating, and the repair can last up to about two years.
A small crack appeared on my car headlight after being hit by a pebble, so I tried using repair glue. The process was quite simple: first clean around the crack, apply the glue, then cure it with a UV light for a few minutes. After drying, it effectively sealed the crack and stopped any leaks. However, you need to be careful—the crack shouldn’t exceed 10 cm, and if the location is too tricky, the glue might not spread evenly, leaving bubbles that affect light transmission. After the repair, you can still see traces upon close inspection, especially on white headlights, and after six months, I noticed the edges of the glue had started to yellow. Overall, it’s a good temporary fix, costing just a few dozen yuan and saving hundreds on a full replacement. But if you want perfection, you’ll still need to replace the lens.
