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  1. #11
    Senior Member Calendyr's Avatar
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    Re: Headlight cracks

    Quote Originally Posted by Mike@ShineStruck View Post
    The tiny cracks are called crazing..it's failed UV coating..

    320grit is sure way to remove it(all the coating ) work your way back to 3k(don't compound nor polish) panel prep then apply a UV coating back on..don't bother with a wax/sealant nor ceramic coating at this point
    That was my iniatial thought as well. But after sanding for 30 minutes with 500 grit, I can't imagine any clearcoat remaining. It really felt like the actual plastic was cracked.

    I will certainly add 320 grit to my arsenal, I never had to use it before doing these, but if lens are really bad, it would speed up the process, so it's a good thing to have it on hand anyway.

  2. #12
    Senior Member Calendyr's Avatar
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    Re: Headlight cracks

    Quote Originally Posted by PurpleTowel View Post
    I've seen a few Audis with crazing in the actual lens plastic, not in any clearcoat. Manufacturing defect. You can find a lot of discussions on Audi forums about issues with some factory lenses, and the manufacturer not covering the damage under warranty. In my experience, it isn't fixable.
    Ok, thank you. If I ever come across this again, I will explain to the owner it can be improved but not fixed. I wasn't sure if it was fixable or not. It did make a major improvement, so that will be the owner's decision to proceed or not. In this particular case, I charged him 100$ to do the job. He asked Volvo the price to replace them and it was 700$, so it's still a major saving even if they did not get back to a 100%.

  3. #13
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    Re: Headlight cracks

    Quote Originally Posted by Calendyr View Post
    That was my iniatial thought as well. But after sanding for 30 minutes with 500 grit, I can't imagine any clearcoat remaining. It really felt like the actual plastic was cracked.

    I will certainly add 320 grit to my arsenal, I never had to use it before doing these, but if lens are really bad, it would speed up the process, so it's a good thing to have it on hand anyway.
    Some coatings are hard where only 320 will do it..Dave so sometimes has to make 3 passes with 320 and he's the headlight master

  4. #14
    Senior Member Mad Wax's Avatar
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    Re: Headlight cracks

    Quote Originally Posted by Calendyr View Post
    Good to know. Have you done a lot of them?
    Only a handful...I too lost money at first as I wasn't aware how much of a pain in the ass they are, but now I definitely set the customers expectations low when I get hit with a Volvo.

  5. #15
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    Re: Headlight cracks

    Subscribed

  6. #16
    Senior Member Calendyr's Avatar
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    Re: Headlight cracks

    Quote Originally Posted by Mad Wax View Post
    Only a handful...I too lost money at first as I wasn't aware how much of a pain in the ass they are, but now I definitely set the customers expectations low when I get hit with a Volvo.
    Well the goal is always to get perfect restoration, but I have seen a few headlights that can't be restored completelly in a reasonable amount of time. I charge for 1.5 hours of work max. In this case I worked 3 hours and still could not get perfection. So next time around, I will have 320 on hand Gotta pay to learn I guess. Out of all the headlights I have done, those were by far the worst.

  7. #17
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    Re: Headlight cracks

    I did a Mustang that had similar problems. It had aftermarket headlight bulbs and I think they created more heat than the normal bulbs and caused it to crack. I am absolutely convinced that the problem was on the inside of the lens and not the outer surface. I have a co-worker that has a BMW X5 that was asking me about headlights and it sounds like he has the same issue, but I haven't checked them yet.

  8. #18
    Senior Member Mantilgh's Avatar
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    Re: Headlight cracks

    I've got my in laws 05 4Runner now and its lights are really cracked up from degradation.

    Several of the cracks look like they go all the way through.

    I'm not sure if these had a UV Coating from factory, I believe some do not.
    ____________
    "The more answers I seek, the more questions I find."

  9. #19
    Senior Member Calendyr's Avatar
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    Re: Headlight cracks

    Quote Originally Posted by Mantilgh View Post
    I've got my in laws 05 4Runner now and its lights are really cracked up from degradation.

    Several of the cracks look like they go all the way through.

    I'm not sure if these had a UV Coating from factory, I believe some do not.
    Very unlikelly they had not UV protection. If they did, they would immediatelly start to turn opaque.

  10. #20
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    Re: Headlight cracks

    I have these cracks all over my headlights. If I sand them down, what would I apply for UV protection?

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