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In this instructable we'll show you how to make a cloudy headlight lens shine like-new again. The process is simple, takes only about 30 minutes, and the repair lasts for around 4 years.

What you'll need:
11 oz. aerosol UV headlight clearcoat
1 half-sheet of 400-grit sandpaper
1 half-sheet of 600-grit sandpaper
1 half-sheet of 1000-grit sandpaper
Masking tape and paper
Spray bottle

Time Required: 30 minutes

Step 1: Mask Repair Area

Mask off the area around your headlight.

Step 2: Sand Headlight Lens

Wet-sand the headlight lens with 400-grit sandpaper, then with 600-grit, and finally with 1000-grit.

Once you are done, wipe it down with a lint-free cloth.

Step 3: Clearcoat Headlight Lens

Apply multiple, light coats of the UV clearcoat from a distance of around 10 inches.

Keep applying layers until the lens is clear.

Step 4: Cleanup

Wait about 10-15 minutes before removing the masking tape and paper.

You are now good to go, and the repair lasts about four years.
I disagree with not benefitting past 1000 grit. this is essentially the same thing plastic modellers do to their cars, for instance. I think the best reason not to go past 1000 grit is simply that you need a "tooth" for the sealer to catch on. if you're not worried about the sealer, go to a higher grit.
Can you take it further with the sanding and after 1,000 grit use a 2,000 grit?
You could, but there would be no benefit.
stateit: It may be marketing, but if the product works, I'm interested. And it does give instructions on how to carry out the project using the advertised product. I wouldn't call it spam unless it was advertising something unrelated to making/DIY. But that's just my opinion.

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