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Self hardening clay

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I need help! I have a question for the experts out there that work with clay. I am troweling clay onto a piece of canvas to create a wallpaper. I will be using self hardening clay since I can't fire canvas. My question can I make it crack. Yes, I actually want cracks to form. Is there anything I can do to make this work? I really appreciate your help and knowledge. Thanks!:icon_cool