How To Cast Plaster | Walls Stencils, Plaster Stencils, Painting .Plaster of Paris. Plaster Mold. Plastic container to mix plaster in. Do not use glass or metal as plaster will stick and not come out. Cup or container to scoop out.plaster paris scoop,Plaster Mixing 101: How to Mix Plaster for Ceramic Molds | Ceramic .Plaster Mixing 101: How to Mix Plaster for Ceramic Molds. July 13, 2016 .. Guy Michael Davis shows how to pour plaster to make a mold for pottery. Whether you need a drying bat, a simple hump .. Can I use Plaster of Paris? Log in to Reply.