I thought these were made of copper or an alloy of same?
Its not rust, but corrosion or indeed any damage near a seem that you need
to be careful of.
Brian

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I've acquired a second hand Chelmer thermal store that was decommissioned a
few days ago. Presumably if I leave it lying around I'm at risk of corrosion
due to the residual water inside and lots of air... How quickly might I need
to think about fitting this?