Hydrocal is a US Gypsum product composed mainly of Plaster of Paris and a small amount of Portland cement. Hydrocal, like its similar formulas Hydrostone, Ultracal, Duracal and others are all used for casting sculptures and other art objects as well as molds. These products are for indoor use only as they rapidly degrade in the rain.
Polyresin is a resin compound generally
used for statues, figurines, and decorative items. It is a sturdy material
that can be intricately molded, allowing a great level of detail with
consistent texture. Additives can be incorporated into the compound to
enhance the material's strength, reduce its weight, add heat stability,
decorative effects, and so on.
Polyresin is also compatible with a large range of different finishes,
including paint and metallic finishes, which is why many decorative pieces
are made from this material.
Slip casting is a technique for production of pottery, especially for shapes not easily made on a wheel. A liquid clay body slip (usually mixed in a blunger) is poured into plaster moulds and allowed to form a layer, the cast, on the inside cavity of the mould. In a solid cast mold, ceramic objects such as handles and platters are surrounded by plaster on all sides with a reservoir for slip, and are removed when the solid piece is held within.
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