Primatoide, a French polymer clayer, makes clever nautilus style shells – hollow ones at that – with a combination of wash away play-doh clay and polymer clays. She uses a log of Play-Doh wrapped in a thin layer of clay to build her design, washing the kids clay out after the shell shape has been baked.
There would be some experimenting to do here – I’d try baking a piece of Play-Doh at clay temperatures and then dissolving it in water to make sure the stuff you have works the same as the clay the author describes in her article.
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