Actually clays like ‘Marblex’ can be reused by the addition of water. You will need to knead (pun unintended) the clay. What I do is when I’m sculpting and you are removing bits of clay and those dry up. I just take the pieces and add them to a plastic bowl that has water in it. Let it sit for a while and then knead. You will find that nice soft clay.
In a case of a large brick of dryed up clay. Just break it up into small pieces and put in water. After the clay has had a chance to rehydrate knead it. Very seldom do I actually want to keep that which I have sculpted. (The perfectionist in me). I just break up the sculpture and rehydrate and can use again.
Remember to use eye protection. In addition clay dust is bad for the lungs. So use a mask when breaking up clay or do any kind of activity that generates dust.
It takes awhile to develop a feel but not that long. That is the wonderful thing about air dry clays like ‘Marblex.’
Have a Great Day,
Jim
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