I have the same issue with my 04 headlights and have buffed them several times with good results but it never lasts. I plan on giving this a try and thought I would share for your consideration.
https://www.youtube.com/watch?v=QCHCihzu-QI
Let me know if you find something that works better.
I used that method and it worked great. It took me a few tries to get the hang of applying the spar/spirits mix but once I did, it worked great.
It looked like standard 9 year old headlight shit before and then the after:
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The clear stuff?
:behindsofa:
Come on now, if I knew, I wouldn't be asking. Never used a sealant, never had a need to use sealant... so I asked.
I just recently used a rubbing compound on my son's Tacoma headlights. Worked very well, he can actually see where he is headed at night now. I watched a video on you tube and there was a guy who used various grades of sand paper with water and then as the final step he used a spray clear coat and it looked amazing. He claims that it is permanent. I also saw that people used toothpaste, brake fluid, Off bug spray, and a vinegar and baking soda mixture. I guess figure out what works best for you.