How to Harden Modeling Clay - STEPBYSTEP
3. If the clay you have purchased is oven-hardening or non-hardening, then you will have to bake it for a longer time. Follow the same steps all over again, but in this case you have to put your object inside the oven for at least an hour, with the temperature set at 300 degrees Fahrenheit. 4. If you do not want to use ovens, you may use a kiln.
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