Most light lenes now are not glass - and the plastic being used seems to yellow over the years.
I used Cerakote on my daughter's 14 yr old Scion headlights lenes - and the results were pretty good!
Today I applied the procedure to the Philips DRL LEDs which I installed in the same car's grill 13 yrs ago.
They are wired to come on when car running, headlights off. So, daylight DRL's.
Purchased from Europe/eBay - sold as replacements for some Mercedes. They are very bright!! Even slightly yellowed - they are bright. They slotted nicely into the grill space - held securely now for over a decade with 3-M autobody tape.
Stig
