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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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What about a separate write up for the mk3 cars ? Your jetta writeup is for a mk4 car.
 

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to be honest, polishing 1 headlight is like polishing any headlight . I will consider it....maybe just add the pics to the existing writeup.
 

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PS, the sanding is the most important part - you have to start with rough-medium, then polish if they're bad. You have to get down to a clean layer first. If they'r enot bad you can just use a polish.
 

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They will work fine. Of course it will work better if you have power tools, but if you're doing it by hand, expect to spend at least 1.5 hours on each headlight...if your arms don't fall off by then.
 
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