Well I drive a main highway 5 days a week for the last 3+ years and my lights were beat to crap. There were stone pits and they were faded pretty bad. In fact, they were so bad my mechanic said he almost didn't pass them for inspection cuz the light output was so greatly affected.
I used some sanding stuff I already had and bought the 3m headlight restore kit. The first light I did came out ok and the second light I did came out great. I figure sometime this summer I'll redo them again and get em perfect...This is a learning experience for me.
I looked online and found that a "regular" uv sealant probably wouldn't work too well since I'm essentially sanding ALL sealant off. I read that most stuff you buy at an auto parts store mostly seals "newer" lights that already have existing UV protection. I made a 50/50 mix of minwax and mineral spirits to seal (recommended by some people online)....we'll see how it holds up. IF ANYONE WANTS A WRITE-UP INCLUDING THE SANDPAPER GRITS I STARTED AND ENDED WITH, PLEASE LET ME KNOW.
In the first pic you can see the difference between the lights. Yes, the light on the right is clean....
Btw, cost me a total of 50 bucks or so.