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 Post subject: Plaskon tube burn repair
PostPosted: Nov Mon 13, 2017 10:07 am 
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Joined: Apr Thu 29, 2010 8:53 pm
Posts: 64
Location: Arkansas 72204
If an ivory Plaskon case has reacted to tube heat by light yellowing, what is the best procedure, if any, to try and remove the yellowing? Thanks for any suggestion or help!


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 Post subject: Re: Plaskon tube burn repair
PostPosted: Nov Mon 13, 2017 12:29 pm 
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Joined: Sep Thu 14, 2006 3:27 pm
Posts: 10036
Location: Carmel, Indiana
If the yellowing is deep in the plaskon, which it probably is, there would be no way to totally get rid if it. Such yellowing is a chemical change to the plascon which resulted from the heat of the tubes.

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Michael Feldt
www.indianaradios.com


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 Post subject: Re: Plaskon tube burn repair
PostPosted: Nov Mon 13, 2017 8:22 pm 
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Joined: Jan Mon 16, 2012 4:15 pm
Posts: 3514
Location: Near Brandon, Iowa
You could try overspraying the discolored area with acrylic auto lacquer. This can be custom-mixed for you at most auto refinishing products stores (which sell supplies mostly to auto body shops). They have a handheld spectroradiometer (no, they don't also do ghostbusting) that can read the actual color value of the "good" plastic and output data that describes a pigment mix formula to perfectly match it. They can also put the mixed paint up in small aerosol cans, which would probably be what you would want (unless you already own a modeling airbrush).

This will all probably set you back $50 or so, but should provide an exact finish match for your radio. For best results you should consider painting the entire panel (i.e. the entire top of the radio).

A less expensive approach would be to strip the radio, clean the case, and carefully respray the entire outside surface with prepackaged acrylic lacquer in a close (but not exactly matching, unless you're very lucky) color. This method should set you back less than $10.

After the painting is complete and dry, fab up a thin aluminum heat shield and stick it to the inside top of the cabinet using automobile external trim double-sided tape. This will dissipate the heat and prevent it from damaging the new paint.


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 Post subject: Re: Plaskon tube burn repair
PostPosted: Nov Tue 14, 2017 3:35 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 11439
Location: S. Dartmouth MA 02748-1225 USA
Plaskon isn't ABS but one could try, Google [formula to whiten yellowed abs plastic]


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