Sunday, September 23, 2012
06 Waste Molds Nº 14
After coating the coddles I made yesterday with three coats of shellac, and letting them dry thoroughly, I am ready to start the clay build-up for the moulage mold of the oil-clay arm. I am using the green Roma Plastilina for contrast to the tan colored Prima Plastilina. The Roma contains sulfur, so it is not suitable for making a silicone rubber waste mold. I started out by using all the coils of clay that I had already made, by twisting them together and flattening them between two three quarter inch thick pieces of wood with another block of wood. When I ran out of coils, I used some of the practice facial features I had made when modeling the figure. In this photo, the flattened coils are shown in back of the mouth that I am getting ready to flatten. My mold is going to be 13 inches long by 4 inches wide. Click on any image to enlarge it.
The oil-clay mouth, flattened.
My coddles are almost four inches deep, so I made a little platform from some scrap wood, stapled and nailed together, to bring the clay build-up higher.
In this photo I have placed the clay build-up on top of the platform, and I am filling in holes and spaces between the flattened oil-clay coils.
Here I have clamped the coddles together, and am filling in with clay around the edges of the coddles.
Next, I removed the coddles and continued filling holes and scraping with a plaster turning tool. Other tools that might be used to do this are a wooden or metal pottery rib, the edge of a piece of wood, or a paring knife, whatever you have handy.
This is the oil-clay arm, positioned on top of the clay build-up. I am now ready to trace around the arm, so I can remove about one half inch of the clay build-up, in the shape of the arm, in order to bury it about halfway into the clay build-up. I do not have to worry too much about getting an excat parting line because the moulage is semi-flexible.
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