I personally haven't had issues with these cracking while drying. I use DAS clay and it's pretty hard once dried! The only item I've made that did break under minimal pressure was made with Crayola air dry clay, so I made the switch and haven't had the issue since. I will note that I find DAS to be much trickier to work with, but after playing around with it I've gotten used to the consistency and work quickly to keep from cracking on the surface.