03-03-2009, 10:59 PM
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But Mad North-Northwest
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Join Date: Sep 2003
Location: SF Bay Area, CA
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Whitening Yellowed Plastic (Sweet!)
This is pretty cool: a bunch of guys have figured out a way to re-whiten yellowed ABS plastic using peroxide. They've released the instructions and formula for the gel. Looks like it works great!
I'm pretty amazed - I'd always assumed such yellowing was irreversible. Somebody should test this on a set of yellowed taillight lenses (I believe they're ABS) to see if it works for that use case.
Retr0Bright » home
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Tom
1991 Spider
1987 Milano Gold
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03-04-2009, 02:05 AM
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Very interesting indeed, providing that the peroxide doesn't embrittle the plastic. No mention of that is made on the site. Might give it a whirl, though ....
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03-04-2009, 09:27 AM
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But Mad North-Northwest
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Actually, if you look at the chemistry pages they explain how it works, and unlike chlorine bleach it should not cause weakening of the plastic.
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Tom
1991 Spider
1987 Milano Gold
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03-04-2009, 11:38 AM
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Very cool (and useful). I found it comical that the advertisement at the top of this thread was for tooth whitening!
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Steve
1986 GTV6 - No 2nd gear crunch.... yet.
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03-12-2009, 01:43 PM
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Bubbles
I wonder if this would "bleach a set of yellowed headlight bubbles clear again?
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03-12-2009, 01:55 PM
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But Mad North-Northwest
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I'm curious as well. On clear plastic, it's not obvious to me how deep the yellowing penetrates the plastic, or how deep this method will bleach the plastic Still, if they're already shot it can't hurt...
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Tom
1991 Spider
1987 Milano Gold
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04-13-2009, 10:31 PM
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La Dolce Veloce
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Location: Connecticut, USA
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What type of plastic are our coolant overflow bottles and brake fluid reservoirs made from?
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Bob Farace
1971 Alfa Romeo 1750 Spider Veloce
1987 Alfa Romeo Milano Gold
Director, Connecticut branch, Scuderia Non Originale
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04-18-2009, 02:49 AM
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Headlight covers often respond well to a dose of Blue Magic metal polish (don't laugh) lightly applied, followed by AG SuperResin Polish. Also works a treat on modern polycarbonate headlamps, as well (toyota's, etc.) - they go from milky and almost opaque to clear. Did this every few years on my Subaru Legacy in California, where ALL exterior plastics quickly turn to cr*p...made such a difference driving at night !
As to coolant overflow bottles and brake reservoirs, they are most likely polypropylene.
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Chris
1977 Spider 2000
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04-27-2009, 04:26 PM
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Yes. I have polished the headlight covers on my Nissan Maxima with good results.
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05-01-2009, 07:36 PM
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i wonder how this would work on soft tops plastic windows?
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don't follow me,i'am lost 
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05-24-2009, 04:25 AM
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nice... and it does not damage the plastic... will try this one out. thanks  |
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