Sculpey UltraLight

Sculpey UltraLight is advertised as being lightweight but hard (when cured).
It even floats!

Sculpey UltraLight is easy to condition and remains flexible when rolled thin before curing. This clay is suggested as a good replacment for aluminum foil armatures, but it can also be use on its own and painted after curing. Sculpey UltraLight comes only in white.

 

 

Sculpey UltraLight comes in a 10-oz. brick. Sculpey UltraLight may not be readily available in craft stores, but it can be ordered on-line.

Sculpey UltraLight -- Official Site