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I bought new lids for my foundry paints from here:https://www.theplasticbottlescompany.com/shop/product/cap-20mm-tamper-evident-flip-top-white/
This kind of thing would be really good.
BOOM!! That's the very badger, you get a cookie for that, but I'll have to wait until I need shed loads, because otherwise the shipping will be more than the lids themselves!