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Discussion Starter · #4 ·
you have to remove enough material to get down to fresh plastic . Some plastic headlights have a hardened top layer, so after sanding it you have to protect it against further damage.

when I was sanding, I used a handheld sander and you can tell by the color of the slurry+water when you are down to good plastic. I really recommend power tools for this if the headlights are bad because it speeds it up. If they're just a little cloudy, hand use is fine since you don't want to remove too much material.

3m makes a good plastic sheet that is just for this purpose.
 
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