Headlight Restoration

From

$135 a pair

Cause

UV on polycarbonate

Method

Wet sand, polish, seal

Why kits fail

No UV seal

Why headlights go yellow

Modern headlight lenses are polycarbonate with a factory UV-resistant hard coat. The hard coat is thin and it wears — road grit, automatic wash brushes, harsh cleaners and years of sun all take it off. Once it is gone the polycarbonate underneath oxidises in UV, and that oxidation is the yellow, chalky haze that spreads across the lens from the top down.

It matters for more than looks. A hazed lens scatters the beam and cuts light output substantially, and on a Wisconsin rural road in November that is the difference between seeing a deer and not. It is also a common inspection failure on a lease return or a sale.

Why the cheap kits do not last

A drugstore kit polishes the haze off and the lens looks new for a few months. Then it yellows again, often worse, because polishing removed the last of the factory hard coat and left bare polycarbonate in the sun with nothing on it. The kits that include a wipe-on sealant help for a season.

The difference between a restoration that lasts and one that does not is entirely in the sealing. The oxidised layer has to come off, and then something has to replace the hard coat that was lost.

How we do it

The lens is masked, wet-sanded through progressively finer grades until the oxidation is gone and the surface is uniformly matte, then machine polished to clarity. Then — the part that matters — a UV-resistant coating is applied and cured, so the lens has the protection it had from the factory rather than bare plastic facing the sun.

From $135 for a pair. Lenses with deep pitting, internal moisture or cracked housings are beyond restoration and we will say so before starting rather than take money for a result that will not hold.