Picture of How to restore headlights on a budget!
There are instructions for restoring your faded/yellowed headlights on a budget.  All you need is some 1500 and 2500 sandpaper and clear spray paint.  I found the sandpaper and some automotive clearcoat lying around at the TechShop in Menlo Park so I thought I'd give it a try and it turned out pretty nice.  I'd imagine you could buy the materials for under $10 though if you don't have the stuff lying around.

If you're interested in TechShop, check out their website,  TechShop is a membership-based workshop that provides members with access to tools and equipment, instruction, and a community of creative and supportive people so they can build the things they have always wanted to make.
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Step 1: Step 1: Sand

Picture of Step 1: Sand
The problem with most plastic headlights is that they come with a very thin "protective coating" that is supposed to lessen the effects of rock chips and possibly deterioration from UV exposure.  Unfortunately, these coatings don't last very long and tend to turn opaque as they age.  The goal with the sanding is to get rid of this coating altogether.

It is a good idea to either remove the lens you are working with, or tape of the surrounding area so that you don't accidentally sand the paint.

Start with your 1500 sandpaper, and grab a little cup of water.  Using plenty of water, sand the headlight lens for at least 10 or 15 minutes.  Dry the lens occasionally and inspect the surface.  Once the protective coating is gone, the surface should be even all around.  If you still see any rock chips you can continue sanding to try to eliminate them as well.

Once you have an even surface with no coating remaining, you can move to the 2500 sandpaper.  Using the same process, sand for another 10 minutes or so, until again the surface looks even and you can't see any scratches from the 1500.

Note: When you are done, the surface should be very smooth, but it will not be clear yet, it will still be foggy from the sanding.
Tomahawk922 years ago
toothpaste works shockingly well too
eed10182 years ago
Thumbs up! Good, easy to follow instructions. I'll be removing the yellowing from my headlights now. Thanks for the great Instructable.
kentuski2 years ago
this is more cheaper if you use metal polish rather than clear coat will not last for long time it will chip off , what i do is sand it with 1000 sand paper and use metal polish rub it until you see it crystal clear, it takes long but the result is best and last longer, or you can make it shorter by using machine for waxing.
profpat2 years ago
nice one,

our honda civic has the same problem, my gf calls it cataract lens..will buy some sandpaper and clear coat spray paint..
jbleazy2 years ago
I like your "before and after" pictures. Very nice.