Step 9Prepare the Box Mold
Seal any gaps at the corners of the box or where the base meets the walls, with an oil-based, sulphur-free clay that won't react with the rubber you'll be using (such as Prima Plastilina).
Attach the sealed plaster part to the bottom of the box with a piece of clay.
Spray the interior of the box thoroughly, including the plaster piece, with a release agent (such as Pol-Ease 2300). Be sure to get all of the corners, undercuts, and other places rubber might find a place to steathily stick to.
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