IOD Air dry clay also called paper clay is an air dry medium. Like other paper pulp based air dry clays, some shrinking, warping, and cracking is expected and results in a distressed, authentically vintage look. Suggested way to apply molded pieces is to take them out of the mould while still moist, then adhere to your project with your favorite glue, ensuring it conforms well. If the surface is vertical, you can use a piece of low tack tape to hold it in place to keep it from sliding.