By EasyHow

How to make a mold for plaster

For casting plaster sculptures, you must first make the form. Previously, these forms often were made of gelatin. Recently, new plastic materials, their properties are not inferior to traditional.

You will need

Two-component silicone
Chipboard container
Wood glue
Sculptural clay
Round stick of small diameter
Wax

Instruction

Take a container to fill. Pick up the boards to shape or cut the edges of the container made of chipboard. Glue parts. Allow the container to dry.

Divide the clay into small pieces. Uniform layers put him in the container. Carefully smoothen the surface of the clay, it should not be any cracks.

Put it into a clay form. Round stick make a hole. They need, in order to connect the two halves of the form together.

Wax the surface of the model.

Calculate the volume of silicone. It can be calculated by measuring the container.
Prepare the molding material. The ratio of the components specified in the instructions,it is necessary to strictly comply. Cook ground only to the portion of the form, which you will do now. Pour the molding material into the container.

Leave the top part alone until such time as it hardens. After that fully remove the clay.

Again wax model. Do the same with the form. Don't forget to coat with wax and holes- "castles". Prepare the silicone, pour it and wait until hardens.

Detach the form and extract the model, and then concatenate the part of the form.

Note

Chipboard can be replaced with wooden planks. You can use a ready-made box of suitable size. Importantly, the material was solid.

Glue the drawer is necessary so that there is no leak.

Carefully read the instructions to the silicone.

Pour the molding material carefully, to avoid bubbles.

Clay you want to remove with all possible care not to damage the surface. Clay must be completely removed.

Remember that silicone is not a very durable material.

As a lubricant it is impossible to use the same material from which is made form.

Useful advice

It is best to use a glue gun, but if it is not – as it should promazhte seams with glue. After drying, it is possible to coat the joints with glue and re-dried.

Sculptural clay can replace conventional construction with putty. Children's clay use is not recommended because it is too soft and sticky.

The clay must be laid about half of the container.

Instead of sticks you can use a regular pencil.

The wax can be replaced with a soap solution.

For casting complex sculptures form must cook in two stages, but three or four, successively filling of the container.