Leftover air dry + ceramic clay should be carefully wrapped according to kit instructions + used within 3-6 months. Otherwise, it may dry out. If that happens, feel free to reach out to us at help@potterywithapurpose.com + we’ll send you our pro tips for rehydrating your clay. We can’t guarantee it will give your clay a second life - so your best bet is to enjoy it all within 3 months of receiving your kit! Here are some of our favorite DIY sculpting ideas to fuel your creativity. P.S. storing your wrapped clay in an air tight container will also help extend its life!