Simply add water. Needs no firing; air dries. Completely nontoxic. Adheres to almost any surface. Versatile - can be sanded, sawed, and nailed. Celluclay is low cost, recycled paper mediums which mix easily and mold quickly. They can be sanded, sawed, nailed and water proofed. Wet Celluclay can be added to areas already dried. And any unused mixed Celluclay can be stored for several days in a sealed plastic bag in the refrigerator. Celluclay adheres to almost any surface and can be combined with a variety of materials. Celluclay requires no special tools for working. (simple sculpting tools include plastic knife, fork, stirrer, toothpicks, cookie cutters, etc.)