Cloudy headlights

Rob Morley pretended :

Absolutely any fine abrasive polish will work, including toothpaste. If the lens is in really poor condition, then begin with a fine wet and dry paper, plus water. Don't use a drill or similar, except slowly with water spray to keep it cool. Polycarbonate is easy to melt with too much heat from friction.

There is still the problem of once they are clear and sparkely, they will not remain that way for long, once the UV gets at them. They are obviously protected by some means when they leave the factory, but that wears of eventually. The best idea I have heard suggested spraying them once polished up, with the clear lacquer as used on car paint work.

I have never had the courage to risk my lenses with that, but has anyone tried it? What does the panel think?

The advice was never paint a polycarb crash helmet.

Followed by never put stickers on polycarb crash helmets.

The reason being that you can never tell what solvents are in the paint or glue and what effect they have on polycarb.

Polycarbonate is quite sensitive to environmental stress cracking when exposed to polar solvents. Headlamp recovery kits typically come with a UV resistant lacquer that is presumably compatible.