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Buffing Scratches Off A CRT Glass.

Discussion in 'Electronic Repair' started by Tim, May 16, 2007.

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  1. Tim

    Tim Guest

    OK, I have this nice TV that has a couple of small scratches on the
    glass. Is there a safe way to buff out the scratch? Normally it would
    not be a problem, but this set will be used for a close up application,
    and it's really irrating at the required distance I need to use it from.

    - Tim -
  2. If the scratches are not too deep, you can polish them out by
    a sequence of grindings with successively finer grits. This
    is long and tedious, but is the technique used for preparing
    surfaces for metallographic examination -- which is also used
    for preparing glasses and ceramics for microscopic exam at

    Alternatively, one could attempt to fill in the scratchs
    with something with the same dielectric constant vs. frequency
    (i.e., same index of refraction vs. wavelength). Water-glass
    comes to mind (sodium silicate solution in water) as a possibility.

    I would try the water-glass first. If it is not good enough,
    it can be removed with water-based solvents. If it is good
    enough you can seal it with a clear coat of your choice.

    For a CRT I would NOT recommend flame-polishing, which otherwise
    would be my first choice for descratching glass.
  3. Sofie

    Sofie Guest

    My experience and observations tell me that you will only make the scratches
    in your CRT more obvious and worse by trying to buff them out.
    Best Regards,
    Daniel Sofie
    Electronics Supply & Repair
    - - - - - -

    Leave it alone and try to ignore them.
  4. You could try that eyeglass scratch remover although I've heard it's not as
    good as the TV ads say (big surprise).
  5. Jim Yanik

    Jim Yanik Guest

    I think I would use an optical epoxy to fill in the scratch,not try to
    polish it out.Scratches are kinda dangerous in CRTs as they provide a start
    for cracks,like you would do for "cutting" glass;scribing it.

    Say,have you seen those TV ads (USA) for the product to fill in scratches
    on eyeglasses? WalMart carries it,in their pharmacy section where the
    eyedrops are located.AND,it sells for less than what the TV source sells
    it! "As seen on TV"....

    It might be worth a try.

    $15 USD,IIRC Opti-Clear is the name,or something similar.

    It is also carried by Walgreens,I believe.
  6. Tim

    Tim Guest

    Yes I have been looking at that kind of stuff since reading the reply
    that suggested water glass. I am also shopping around for a windshield
    repair kit, which is kinda the same technology.

    I think that kind of fix would be much better and safer than polishing
    or buffing.

    Thanks to all whom replied to my question. I'll post the results when I
    make the repair.

    - Tim -
  7. Guest

    What about that stuff they use to repair cracked windshields? Or is
    that no longer available either?

  8. I had one with two 'digs' in the safety glass. We used a windshield repair
    kit on it with reasonable results.
  9. Guest

    I have had good luck in the past , using my Dremel motor tool a cloth
    & jewelers polish that came with a older motor took kit. Good luck C
  10. Unless it's non-AR-coated polished glass, this sort of approach will likely
    make it worse.

    --- sam | Sci.Electronics.Repair FAQ:
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  11. I bought a tube of the stuff. Applied it as directed and it did an
    extremely lousy job.

    I think it's $4 a gallon acrylic floor wax put into fancy bottles.
  12. Jim Yanik

    Jim Yanik Guest

    The TV ads show a BOTTLE of the stuff,not a tube.
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