| Suffer not the Unclean
Join Date: Nov 2006 Location: Edmonton, AB Age: 29
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Copper shouldn't be reactive with anything you'd find in acrylic paint. Pennies are stainless steel up here anyway! =) It's possible that simply keeping paints well-mixed contributes to preventing them from drying out. (Or prevents the appearance the the pot is starting to dry out due to the bit in the lid getting clumpy?)
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