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Not strictly Gunpla but what happened here? I painted this with Mr. Super Metallic Chrome Silver II and it was fine for months, but it's suddenly come out in these weird black spots. Thought it might be some kind of mould (a bit concerning but not impossible) but they aren't coming off at all. It almost looks like aluminium corrosion (t. worked in plane museum and have been around bare-metal skinned aircraft), which would be very weird given how suddenly they've appeared and this being paint, not pure metal.
