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<p>[QUOTE=&quot;Scuba4fun777, post: 5275481, member: 75199&quot;]It may or may not be repairable, depending on how deep the yellowing is. After some years of UV and/or ozone exposure, many older plastics will begin to yellow and even craze (exhibit small, hairline-cracks) at the surface. Modern plastics tend to have additives that will inhibit this effect. If the damaged material can be removed, you will have temporarily solved the problem. My guess is that there may be something you could coat it with after restoration to prevent further damage, however I’m not aware of anything right off. </p><p>FWIW, I bought a 1952 proof set encased in a damaged acrylic block on eBay a few years ago for a few bucks above spot. With gloves and a hammer, I managed to free all of the coins and only damaged the nickel in the process. After a soak in solvent to remove the excess plastic and a purchasing a replacement 1952 proof nickel, I made out ok by relisting it on eBay. It wasn’t really worth the effort though.[/QUOTE]</p><p><br /></p>

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