This popular sculpture supply was originally developed for use in modelling animatronics, claymation, claytoons and sometimes to cast monster masks. A growing number of professionals including clay art therapists and taxidermists are choosing this clay. This moist water based clay is extremely versatile with plasticity properties similar to many of today's most popular oil based clays. Like any water based clay, this clay needs to be kept moist to prevent hardening, preferably with a spray bottle or a damp towel. Saran wrap is also commonly used.