Oxidisation: headlight lenses are coated in a clear layer to help prevent acrylic from oxidising. Over time the coating wears off and UV light oxidises the casing, turning it yellow.
Are headlights clear coated?
Get a full load of sunlight will make them oxidise to yellow much faster than a brand new headlight. The job of a clear coat is to be an extra barrier between what it is coating, be it paint or a headlight, and the outside elements, including the sun.
What material is headlights made of?
polycarbonate plastic Most headlight lenses are made of polycarbonate plastic. This strong plastic is perfect for taking on harsh road conditions without breaking, which you definitely want, but it doesnt play well with the sun. To protect it initially, manufacturers coat the lenses with a UV protective film.
How do you keep your headlights from yellowing?
How to Keep Headlights from Turning YellowPark your car in the shade: If possible, park in the garage or under a shady tree. Wash your car: Every three months, wash the headlights with automotive soap to clean away dirt and chemicals that promote fogging.
How do you stop headlight oxidation?
Park your car in the shade: If possible, park in the garage or under a shady tree. If you dont have that option, face your headlights away from the sun when parking outside to reduce UV exposure and slow the oxidizing process.