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Removing scratches from clear instrument plastic

Discussion in 'Troubleshooting and Repair' started by dude, Jun 18, 2014.

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  1. dude

    dude

    35
    6
    Apr 15, 2014
    A couple of weeks a ago I accidentally put a great big deep scratch onto my 187's LCD glass with a screwdriver. I'm not normally that much of a klutz but hey I repair more than I wreck. I wasn't too worried as I knew I could get it out but it's still been annoying the hell out of looking at it as it cast a big shadow onto the LCD. Finally got the chance to do it this morning.
    My method for polishing things like that is a soft cotton cloth and a small amount of Brasso. Polish in a circular motion and make sure to mask the edges with tape (I use scotch tape) as you don't want Brasso running into any crevices as you'll have a hell of a time getting it out later.
    For restoring old instrument dials etc, that's how I do it and with some elbow grease you can get them looking like new.
    Here's the 187, anything you see on it is just lint from the cotton cloth.
     

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  2. Jagtech

    Jagtech

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    1
    Feb 22, 2014
    Is that the actual LCD glass that's scratched, or is there a clear plastic protective face in front of it? IIRC, my 77 has a separate plastic face, which you can polish with some rouge and a buffing wheel.
     
  3. dude

    dude

    35
    6
    Apr 15, 2014
    The plastic face, LCD sits under that. Yes rouge is also good although never tried it on plastic, I know its good for giving steel a mirror finish as a final polish, either in paste form or just plain old iron oxide. There is also pumice powder, talcum, graphite, even cigarette ash, depends what you're doing. I don't use a buffing wheel on instruments myself as its very easy to overdo it. That 77 is a great meter :cool:
     
  4. davenn

    davenn Moderator

    13,674
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    Sep 5, 2009
    just clarify ... you removed the scratch from a plastic face ? not a glass one as mentioned in your first post ?
     
  5. dude

    dude

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    6
    Apr 15, 2014
    yep, the clear plastic face, uppermost. sorry about that.
     
  6. davenn

    davenn Moderator

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    1,892
    Sep 5, 2009
    cool :)

    do you have a before pic so we can see the initial damage ?

    D
     
  7. dude

    dude

    35
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    Apr 15, 2014
    No as it occurred to me to post this up only after I finished. You can remove some pretty deep scratches with this method, its just a matter of being patient. It took me about 40 minutes on this one. Just listen to some music and noodle away.
     
  8. Morgan

    Morgan

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    0
    Jun 22, 2014
    Meguires Plast-X is also very good for removing scratches from plastic, so is toothpaste!
     
  9. davenn

    davenn Moderator

    13,674
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    Sep 5, 2009
    Meguires Plast-X <--- never heard of that ?

    Toothpaste, yes a good gentle cleaning abrasive :)

    D
     
  10. Morgan

    Morgan

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    Jun 22, 2014
  11. davenn

    davenn Moderator

    13,674
    1,892
    Sep 5, 2009
    ahhh Ok maybe native to your country ??

    where are you from ? .... put it in your profile

    don't want street addy LOL just country will do

    D
     
  12. Morgan

    Morgan

    16
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    Jun 22, 2014
    There you go Dave, Kent in England :)
     
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