This page is a good starting point if some of the words we use are new to you. A thickening agent used for paints, resins and pastes. Used with Pros-aid to blend edges of foam latex appliances.
Particles are extremely dangerous to inhale.
The final piece taken from mold. Usually made from Casting plaster, Hydrostone, foam latex, slip latex, UltraCAL 30 or other material. The do a body cast the artist would prep the model, make a mold and take a cast from the mold. Very much like Plaster of Paris except that it has a slower setting time. Forms a skin when used in a mold.