![]() It's not literally unpaintable, though, but unlike ABS or other materials that make up the majority of TF toys it doesn't properly bond with the regulated factory paints Hasbro uses. The exact materials can be either POM or nylon blends, and it's often used for areas that bear a lot of torque or weight, like hinges or sockets. Then you have "unpaintable" plastic, which isn't actually unpaintable. Still, this doesn't stop people seeing a modern toy with gold plastic, or even sometimes gold paint, and claim that it's destined to deteriorate. ![]() It's simply a lower grade plastic combined with the face that his torso is a thin-walled empty box made of hinges. His metallic copper plastic is quite sturdy, it's the brown plastic that's weak, but it has nothing to do with GPS. (gold is merely the most common, due to the amount of metallic flakes needed to replicate the colour) There's also instances of mis-attributed GPS, most famously Transmetal Megatron. In fact GPS can and has effected other plastics as well, for the same reason, even if the colour is not actually gold. This is what caused older gold plastics to be weak, not anything to do with the colour actually being gold. Instead they basically function as gaps within the plastic, like Swiss cheese, severely compromising its solidity. Minuscule metallic flakes are mixed in with the non-metallic yellow-ish plastic, giving it that gold-like shine, but the flakes tend to not bond at all with the plastic. The reason gold plastic was as brittle as it was is due to the method of achieving a metallic gold effect. With GPS, or gold plastic syndrome, people seem to think that the mere colour gold is somehow a ticking time bomb. I think my favourite has to be all the misconceptions around certain plastic types, but my two favourites are GPS and "unpaintable" plastics.
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