Milliput is a two-part epoxy putty from England. Use it for sculpting, gap-filling, and scratch-building. One of the definitive mediums of many top sculptors.
Magic Sculp is a two-part epoxy putty specifically designed to meet the needs of modelers, crafters and sculptors alike. Its grain structure is finer than any other product available and will not shrink or crack even when formed in large structures. It can be shaped by hand or with modeling tools, sanded, carved, painted; you can attack it with a grinding tool and the cured material will not break apart or loose its shape. Magic Sculp will cure at room temperature.
Celluclay
Instant Papier Maché
The original papier mache. Simple to prepare - just add water. Requires no firing. Air dries into a stronge hard permanent material like wood. Adheres to almost any surface. Can be sanded, painted, sawed and nailed
Uh, look at this.