Clay molds?

Have you ever tried making molds out of modeling clay instead of silicon?

I'm curious if it would work for a one time mold that could be destroyed afterward, or if there is some reason it might not work?

mikeasaurus29 days ago

If the clay was dry, smooth, and you used a release agent, then it could work as a mold if you destroy it after. If you pour the concrete into clay while it is still wet the concrete will draw moisture out of the clay and will produce weak results.

adillbeck (author)  mikeasaurus28 days ago

Or I suppose I could line the clay mold with plastic wrap or something like that first.