BA for sand casting sculpture

Sand Casting

There are many ways in which to produce a finished sculpture and some are more complicated than others.

Sand casting is a quick and easy way to make a sculpture which looks good and can be finished in a variety of ways.

One simple way is to make a model in a non drying clay such as plasteline or one of the other modelling materials that can be bought in a craft shop. Do not make the shape too complicated and leave one side of it as a flat surface. A mask, plaque or paperweight would be the best shape to start with, as bits that stick out, such as arms or legs are not really suitable for this type of casting.

Use a cardboard or wooden box as a casting tray. This should be at least three centimetres larger all round than the model. Pour damp sand into the box, again making sure that there is sufficient depth of sand.

Push the model into the sand until the flat surface is level with the top of the sand. Use a piece of wire or a thin wooden skewer to pull the model out of the sand. The imprint of the model should be left behind in the sand. This is the mould for the finished sculpture.

Now mix up some plaster of Paris, always making sure you add the plaster to the water. Sprinkle the powdered plaster into the water and remove any lumps. An old spoon can be used for mixing. When the mixture has the consistency of thick cream, or just sticks to the spoon, pour it into the sand mould.

Leave to set for at least thirty minutes and then take the moulded plaster cast out of the sand.

Before putting any decoration on the plaster cast make sure that it is completely dry.

Seal the surface of the cast with polyurethane varnish.

Use acrylic, oil or spray paint to decorate the surface.

Coloured shoe polish can also be used.

This is only one way of producing a finished sculpture, but do have a go, it is great fun.

Something different next time.

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