PLUS Clay is a premium quality, natural clay that is self-hardening. It has exceptional plasticity and ultra fine grade, which allows for excellent detail and versatility. This odorless clay can be used straight from the package! PLUS Clay air cures to superior strength and durability (will not crumble when dry), with minimal shrinkage. It can be carved, sanded, and drilled when dry, and will accept virtually any finish. PLUS Clay with a thickness of 1/4 inch will take approximately 24 hours to dry. Drying times will vary depending on the thickness of your piece and the amount of humidity in the air.