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This one's my fault, but I accidentally got a dab of future shine or something on Mixmaster's front bumper while trying to tighten his ankle joints, and in trying to clean it off I ended up smearing away some of the grey paint... unveiling the grey plastic underneath. I guess if this really bothers me I can just wipe the rest of the grey paint off.
Both figures use grey plastic painted grey and purple plastic painted purple in some areas, I have no idea why they did that it's bizarre. At least it's well colour-matched.