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Prevent headlight yellowing?

Discussion in 'Detailing' started by D44boy, Aug 23, 2012.

  1. Aug 23, 2012 at 10:40 PM
    #1
    D44boy

    D44boy [OP] Well-Known Member

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    What's the best way to prevent headlight yellowing/hazing? I heard terry towels are bad, and you supposed to only use microfiber on them. Wax them? RainX them?
     
  2. Aug 23, 2012 at 10:42 PM
    #2
    whippersnapper02

    whippersnapper02 Well-Known Member

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    I know waxing helps.
     
  3. Aug 23, 2012 at 10:44 PM
    #3
    D44boy

    D44boy [OP] Well-Known Member

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    so does it actually have like a clearcoat?
     
  4. Aug 23, 2012 at 11:25 PM
    #4
    iroh

    iroh Well-Known Member

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    Yes it's a form of clear, and I presume the best (OEM) are UV-blocking.

    When you wetsand and polish a really bad set of lenses, you'll find they yellow up again very quickly if they're not sealed (~3 months), whereas properly sealed lenses last years. It's the sunlight UV accelerating oxidation that causes the yellowing (which is why garage queens tend to have clear lights forever and the car in the yard seems to age so quick).

    If the clear is polished off, wax will slow the yellowing again, but wax only lasts a couple weeks and POOF oxidation takes off again. That's why the better restoration kits include a sealant.

    CR had a test of those a while back.

    For good lights, I keep the wax/sealer off myself until it starts to develop microfractures in the sealing layer, but that's just my way. I don't want to chance a chemical catalyst.
     
  5. Aug 23, 2012 at 11:28 PM
    #5
    Khaos

    Khaos Well-Known Member

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    I use Meguiars Plast X on my headlights with every wash, keeps 'em looking new.
     
  6. Aug 26, 2012 at 10:58 AM
    #6
    Dirty Jersey

    Dirty Jersey Rich

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  7. Aug 26, 2012 at 2:05 PM
    #7
    Rich91710

    Rich91710 Well-Known Member

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    Do not use the regular "yellow" Rain-X on any plastic or painted surfaces.
     
  8. Aug 26, 2012 at 4:24 PM
    #8
    Dirty Jersey

    Dirty Jersey Rich

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    What do you mean?? It's a headlight restoration kit. And it worked pretty well.
     
  9. Aug 26, 2012 at 5:58 PM
    #9
    Rich91710

    Rich91710 Well-Known Member

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    The restoration kit is fine.

    I was referring to the "plain yellow" or original Rain-X.
    It's plastered all over the packaging to not use it on plastic, but it doesn't stop people from reading something and using it without reading the warning.


    Like the moron with a Yamaha R1 who poured a bottle of NOS energy drink into his tank... bought it at the auto parts store, saw it on the endcap at the register.
    Sometimes people don't pay attention when one name applies to 4 or 5 very different products.
     
  10. Aug 26, 2012 at 7:20 PM
    #10
    Dirty Jersey

    Dirty Jersey Rich

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    Nos?!?! Really? Unbelievable!!! I was referring to the HL restoration kit I made the link too, but you're correct in reading labels before using
     
  11. Aug 26, 2012 at 7:46 PM
    #11
    Rich91710

    Rich91710 Well-Known Member

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    I didn't quote, but I was responding not to your post, but to the OP who commented on using Rain-X.
    I saw your post, which is why I included "regular yellow"

    I know there's a bunch of Rain-X products now, including some for plastics and paint.
     
  12. Aug 28, 2012 at 2:15 AM
    #12
    808TRDTaco10

    808TRDTaco10 Black Sand Mirror

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    In my experience, waxing a lot keeps them looking good (I wax my truck once a week, including the headlights :eek:) When I'm in class the truck sits out in the direct sun and the headlights still look brand new. Make sure you use a high quality wax and NOT a polish for protecting the lenses.
     
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