Whitening yellowed plastic?

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Whitening yellowed plastic?

Postby NuclearConvoy » Wed Jan 31, 2018 8:19 am

Hey guys,
Sorry if this is in the wrong part of the forum and feel free to move it. I have been trying to find out if there is a way to whiten slightly yellowed plastic. I have seen some techniques on how to do it online but they all require that I submerge the plastic in some chemical bath type deal for lengths of time. The figure I want to whiten (All white aerialbot limb from Combiner Wars) has stickers and other paint applications so I was hoping to do spot whitening as it only has parts that have yellowed (I kept it in a bad place apparently...) I'd prefer not to sand it as that would likely lose the glossy finish. I'd prefer not to have to buy a new one too...
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Re: Whitening yellowed plastic?

Postby JelZe GoldRabbit » Wed Jan 31, 2018 11:32 am

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Peroxide is used for yellowed plastic yes, but the tested figures were mainly G1 era. Newer figures may pose some difficulties due to the different composition of the plastic type. I think I read that someone tried it with Classics Ultra Magnus, but the results were... pretty much less than stellar to say the least.
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Re: Whitening yellowed plastic?

Postby blackeyedprime » Wed Jan 31, 2018 11:45 am

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Not so sure but I would suggest looking into methods used for restoring old yellowed NES/Snes consoles if that is of any help.
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Re: Whitening yellowed plastic?

Postby Emerje » Thu Feb 01, 2018 9:05 pm

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JelZe GoldRabbit wrote:Peroxide is used for yellowed plastic yes, but the tested figures were mainly G1 era. Newer figures may pose some difficulties due to the different composition of the plastic type. I think I read that someone tried it with Classics Ultra Magnus, but the results were... pretty much less than stellar to say the least.

I wonder if they did it right? If they didn't expose it to direct sunlight/UV light then it wont work. I've also seen that it isn't necessarily the chemical itself that is needed for the reaction, but the gasses released. To prove this I saw a video where an ozone generator is used to pump ozone into a sealed container with a yellowed plastic keyboard key cap and then exposed it to sunlight with great effect on its own.

People do report that peroxide doesn't effect stickers so that's a plus. I definitely wouldn't trust "retrobright" on them since it's a paste.

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