I'm doing a color flow piece (my first one) and have done the outline. However, all of the filling in is different colors than the outline, and the directions I've got say to let it harden for 2 hours before filling in. Will the mixed color flow (not thinned yet) be OK if I leave it overnight and fill in the morning? How should I cover it? Just cover the bowl with a regular cover, or leave it covered with a damp towel? HELP! Thank you!
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