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Looks like someone had the headlights clear coated for additional protection in the past. It works, as clear coat offers UV protection, but correct clear coat compatible with polycarbonate lens must be used. Otherwise, you end up with peeling clear coat...
You'll need to sand down the whole head light to get rid of this. A lot of careful sanding. Then, you'll need to treat this as any old headlight that has lost it's factory applied UV protection: either clear coat it again, apply other UV protectant (those usually last a few months to a year and have to be re-applied), and/or add "clear bra" film (several companies sell those precut).
Looks like someone had the headlights clear coated for additional protection in the past. It works, as clear coat offers UV protection, but correct clear coat compatible with polycarbonate lens must be used. Otherwise, you end up with peeling clear coat...
You'll need to sand down the whole head light to get rid of this. A lot of careful sanding. Then, you'll need to treat this as any old headlight that has lost it's factory applied UV protection: either clear coat it again, apply other UV protectant (those usually last a few months to a year and have to be re-applied), and/or add "clear bra" film (several companies sell those precut).
The headlights do come with a UV protection coating, most all plastic lense headlights do as you've probably seen, some is better than others. There are many brands of protections coatings you can buy to reapply. Sylvania/Osram makes a kit that is pretty good, you just need to take your time. Getting the UV coating on nice and consistant at the end can be a challenge (I've only done one set on an older Mercedes SL). Maybe others will chime in on how they did it. A hair dryer with just cool air may be a good choice I though after the fact.