I found this out by accident. While busy kneading my putty to replace a broken window (the neighbours son hit a cricket ball through the glass. For our American Friends, it is about the size of a baseball.) I accidentally dropped the putty into a bucket of dry cement.
I kept kneading and used it. To my surprise the putty hardened very quickly. It is still OK. No cracks.
I tried it again, this time I dipped it into the dry cement and again I had the same result.
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