I need a clay-like material that you can form by hand into a shape, leave it sit for a while - preferably a few hours or a day or less, and it hardens very firmly. I'm talking about a few ounces or a pound, not something very large.
Something preferably available locally, probably at a hardware store, Walmart, Target, or suchlike?
If so, what is it called?
Thanks very much.
TIA