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thick cream. Pour this slowly over the two halves of the head, making sure there are no bubbles against the plasticine. Fill the frame until the highest parts of the plasticine halves are covered by at least 1/2 inch of plaster. When the mould is dry, turn it over and remove the halves by carefully prying them out with a screw driver. Break off any overhang of plaster around the edges of the two depressions, and your mould is ready. Casting Plastic Wood The inside surface of the mould must be lightly but thoroughly greased with Vaseline before the plastic wood is applied. Fingers should also be lightly coated with Vaseline for handling the plastic wood. Apply it carefully, pressing it firmly into all the features of the mould, A, and trying to maintain a uniform thickness of an eighth of an inch. The wood must be left to dry naturally. Do not use direct artificial heat. Test the dryness of the wood by pressing at the thickest part; it should be rock hard. Remove the two halves of the head from the mould by lifting from the back edges, B. Join the two halves together as soon as possible, as they tend to warp if left standing. If the edges do not butt together evenly, you can trim them with a sharp knife or by rubbing them gently in a circular motion on a piece of sandpaper lying flat on a table. Trim the bottom edges of the neck on each half so that they match. Prepare the edges for joining by first putting glue around the edges of both halves. Then put a little plastic wood on top of the glue all around the edge of one side only. Place the halves together, lining up the features at the front of the head carefully, C. The back can be fixed later. Build a small rim around the bottom of the neck, D, to aid in joining the head to the body later. Smooth the excess wood and glue into the joint and allow to dry. The head can be finished with added plastic wood and careful sanding. |
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