Knead together equal amounts of silicone Part A and Part B until well blended and uniform in color.
Apply a thin layer of Release-Dit to surface of sphere. Form a flattened disc from silicone and press sphere into it. Mold silicone around bottom half of sphere, forming a thick rim with 4 corners.
Press pieces of a dowel into corners of rim to form dimples that will allow the top part of the mold to interlock with the bottom. Wrap with rubber band to secure silicone to sphere. Allow to cure for one hour.
When cured, unwrap and remove dowels. Apply a thin layer of Release-Dit to upper surface of rim and dimples. Knead together equal amounts of silicone Part A and Part B until well blended and uniform in color. Mold silicone around top half of sphere and rim, pressing firmly. Cut a hole in the top with a straw for filling. Allow to cure for one hour. With a sharp blade, cut a notch through both parts of mold along one side of rim for alignment. Separate mold, remove sphere and wash well. Mold is now ready to use.
Silicone Plastique is food-safe. Filled mold can be frozen or heated up to 400 degrees F.
Playing with Fire and Water 
That is neat, I’ll need to try it out.
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That is so awesome.
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