What is Automotive Headlight Restoration Technology?

[VanCayden]

Automotive headlight restoration technology can repair various minor scratches, deep scratches, oxidation corrosion, cracks, and other surface damages on car headlights. However, it cannot restore headlights when the surface is penetrated. Below is a detailed introduction to automotive headlights: 1. Overview: Automotive headlights, also known as car front lights or LED daytime running lights, serve as the "eyes" of a vehicle. They not only affect the owner's external image but are also crucial for safe driving at night or in adverse weather conditions. 2. Additional Information: A light booster involves adding two thicker wires controlled by a relay between the headlight and the battery. The principle of light boosting is to reduce voltage loss in the circuit, ensuring that the voltage applied to the headlight is nearly equal to the actual battery voltage.

[DelBrayden]

I often help friends fix car lights, and yellowing or foggy headlights are one of the most frustrating issues for car owners. Headlight restoration mainly involves removing the surface oxidation layer. If you take it to a professional, they will manually sand it using 800 to 3000-grit wet sandpaper in sequence, each pass with a finer grit. After smoothing out the scratches, applying the UV coating is crucial—it hardens under ultraviolet light. Professional shops also have coating machines, making the lights as clear as new. DIY kits are available, but be careful not to over-sand and damage the lens. For severe cracks, the restoration effect may be less satisfactory, and in such cases, replacing the headlight might be more worthwhile.

[DeFaith]

Last time, I had a lot of fun fixing the headlights myself. The repair kit I bought online cost only a few dozen yuan and included sandpaper, spray, and tape. First, I carefully taped around the headlights for protection and started sanding horizontally with coarse sandpaper. After removing the yellowed surface layer, I switched to vertical sanding with finer grit until the surface turned matte. Then, I cleaned it with a special degreaser. Finally, I sprayed the coating evenly, moving the can at a steady pace, and let it air dry for half an hour. The key is not to skip the sanding steps—I tried cutting corners once, and the results weren’t as good. This kind of repair can last one or two years, saving me seven or eight hundred yuan compared to replacing the headlights.

[JakeDella]

It's quite common for car detailing shops to offer headlight restoration services. They first use power tools for deep sanding, which provides a more even finish than manual sanding. After sanding, a resin solution is applied to fill in fine scratches, followed by a spray of a triple-protection coating to block UV rays. The entire process takes about an hour, and spending around three to four hundred yuan can restore foggy headlights to about 90% of their original light transmittance. This technique is suitable for slightly yellowed headlights but not for those with internal fogging. Some shops guarantee the results for up to two years, making it a much more cost-effective option than replacing the headlight covers with aftermarket parts.