“Plus” clay is a premium quality, natural, moist self-hardening clay. Its exceptional plasticity and ultra-fine grade allows exceptional detail and versatility yet air cures to a superior strength and durability with minimal shrinkage.Suitable for all hand-building methods, throwing on the pottery wheel, hand sculpting - can be kiln fired. Completed air-dried pieces are ready to be decorated after 24 hours and should be coated with a water resistant finish.