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I have a friend who shoots a little propane into his varnish cans to keep oxygen off the surface (propane is heavier than air).
I was thinking there's probably a way to do the same thing with a non-flammable gas, like carbon dioxide. Drop a chunk of dry ice in your pyrex container, and put celophane over it. Or get co2 cartridges and shoot a little gas in. The paint will be protected from oxygen. That way you don't have to mess with water.
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