Grasshopper, you are going to have to learn patience.
Have you considered Plastilina clay? It's oil based, so no moisture and no need for mold release. And it's softer and easier to sculpt...just make sure it's sulphur-free. It's what I use. Unlike Theobromine, I prefer hard resin molds, but she's having great success with urethane rubber molds.
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