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tuner-window got milky - what can i do ?

Discussion in 'Tech talk' started by autoreverser, Dec 5, 2017.

  1. autoreverser

    autoreverser Well-Known Member

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    folks, i'm busy restoring a Grundig mini-receiver. got almost everything right yet but the plastic-window of the tuner turned milky - it's not scratched, just getting blind. is there a way to fix it or do i have to look for replacement ?

    thanks for support !
     
  2. Cassette2go

    Cassette2go Active Member

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    I have a similar issue with a jvc rc-575 here is a few pictures of it as you can see with different exposures It is Green in color

    I wish I knew of a solution to get this back to clear too?
    IMG_3091 JVC RC M90 m70 m50 770 575 656 bedroom 23 nov 2017.JPG

    IMG_3094 JVC RC M90 m70 m50 770 575 656 bedroom 23 nov 2017.JPG IMG_3095 JVC RC-656C 717 363 555 747 565 M80 bedroom 25 Nov 2017.JPG IMG_3096 JVC RC-656C 717 363 555 747 565 M80 bedroom 25 Nov 2017.JPG IMG_3097 JVC RC-656C bedroom 25 Nov 2017.JPG IMG_3098 JVC RC-656C 717 363 555 747 565 M80 bedroom 25 Nov 2017.JPG IMG_3099 close JVC RC-656C 717 363 555 747 565 M80 bedroom 25 Nov 2017.JPG
     
  3. Jorge

    Jorge Active Member

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    Foolproof way of dealing with aged acrylic is to sand and polish it:
    Spit Shine talk
    or flame-polish if you are brave enough:
    Flame-polishing

    Or try this:
    Wet the window with a drop of water, if milkiness disappears then you can just put a layer of come clearcoat, just do not use spray-can because it has to "seep" into all those micro-cracks while still wet. The easiest would be Pledge floor Finish: inert, rock-hard when dry. One of the "know-how" secrets among plastic modelers :cool: If Pledge does not work, you can always go with Plan A :)
     
  4. Jorge

    Jorge Active Member

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    Pledge can be further diluted with some alcohol in water, meaning Stoli... Now you know why Pledge is my buddy ;)
    And you can tint it with water-based (acrylic) "clear" paints (Tamiya)!!!
     
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  5. Mister X

    Mister X Active Member

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    Jorge likes this.
  6. Jorge

    Jorge Active Member

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    @Mister X +1!!! Nothing beats the elbow-work and sore muscles when polishing plastic headlights on my old Saab!!
     
  7. Mister X

    Mister X Active Member

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    I grabbed the stuff with the foam ball and ran it through a corded drill, worked great!
    (on my car lights)
     
    Last edited: Dec 10, 2017

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