• I think it's cement spray or some kind of flooring screed overspray. I need to clean it off and check the disc over really because I don't know if sitting in the south facing sun for 5 months has done it any favours. The other sidewall of the tub is looking decidedly more suntanned than this side.

    It's old Russian though. So far it has survived cold war, communism, fall of the Soviet Union and now global apocalypse and a little bit of neglect. It'll be fine.

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