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Step 12Prepare the Rubber Mold for Casting
Before you can cast the plastic part, you need to make a cap for your mold. Coat a piece of scrap wood (large enough to cover the opening that was formed where the plaster part met the base of the box mold) with shellac. Once dry, apply some petroleum jelly to it to help create a seal when applied to the mold.
Prepare the mold and cap by coating thoroughly in release agent. Find two (or more) rubber bands and ensure they can hold the two pieces of the mold together firmly when placed around the mold.
Place the rubber bands around the mold, keeping them out of the way of the opening, which you should orient to the top, and keep the cap handy.
Prepare the mold and cap by coating thoroughly in release agent. Find two (or more) rubber bands and ensure they can hold the two pieces of the mold together firmly when placed around the mold.
Place the rubber bands around the mold, keeping them out of the way of the opening, which you should orient to the top, and keep the cap handy.
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