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Step 3Build a frame
To make a pour mold around the breast, you are going to need a frame built around it into which you can pour the rubber. The best thing that we found to house the plaster model of my breast was an empty 2 gallon water container.
When you've found a suitable container or casing for your model, cut a hole in the bottom into which the plaster breast fits snuggly and then glue it in place from the outside with hot glue. (To ensure that the surface area of my mold would not be much larger than the surface area of the plaster breast, I added an extra wall to the inside of the container. While not necessary, I'd recommend it, though, frankly, it depends on the size of the model.)
Make very certain that the glue fills in all possible cracks from which the polyurethane rubber may leak. (To be on the safe side, you also may want to tape around the outside of the rig with duct tape.)
When you've found a suitable container or casing for your model, cut a hole in the bottom into which the plaster breast fits snuggly and then glue it in place from the outside with hot glue. (To ensure that the surface area of my mold would not be much larger than the surface area of the plaster breast, I added an extra wall to the inside of the container. While not necessary, I'd recommend it, though, frankly, it depends on the size of the model.)
Make very certain that the glue fills in all possible cracks from which the polyurethane rubber may leak. (To be on the safe side, you also may want to tape around the outside of the rig with duct tape.)
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