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" Mold Making " |
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Plaster Moulds |
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Plaster is perhaps my favourite media because of its versatility. You can cast it, carve it, stick blocks of it together (with more plaster) and, if you don't want the finished article to be made from plaster, it's dead easy to make a latex mould (see article elsewhere on this site) from the plaster original. Plaster will take on a very high degree of surface detail when cast in a suitable mould and is an excellent material to use particularly if you want to carve modifications afterwards.
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Casting is usually done in a latex or rubber mould. More solid moulds can be used but it is better to use a flexible mould even if this needs to be enclosed in a support casing (see article on making latex moulds for more details) to stop it distorting under the weight of the plaster. The reason for this is that when the plaster is poured into the mould there will be a tendency for air bubbles to get trapped. This can be overcome by filling the mould only about a third full and then flexing and tweaking the mould to dislodge any bubbles. When the entire inner surface of the mould has been coated in this manner the mould is topped up. Obviously for the purpose of casting a slightly runnier mix than 'normal' is required. See more about plaster moulds. |
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Learn more about mold making |
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