Find a container that is non-porous and large enough to accommodate all the models while leaving a minimum of 1/4 inch of space around each one.

The container should be absolutely clean and have a flat, level bottom. In this step-by-step a food storage container available from any grocery store was used.

Tip: Applying a thin coat of Release-Dit™ inside the container ensures easy removal of the mold.

The five medallions used here are made out of plaster which is porous and should be sealed before applying any silicone rubber. Use Seal-Dit™ to effectively seal the plaster for a smooth finished mold cavity. In order to prevent air entrapment and duplicate the finest details, apply a skim coat working a small amount of Silicone Plastique® into the indentations on the surface of all five medallions. Tip: Only mix enough Silicone Plastique® to skim coat the medallions. It is recommended that you do not mix the entire amount of Silicone Plastique® required for the whole job and instead mix in batches. This ensures that you are always working with product that has the best consistency for good application.

When making a silicone mold, make sure that there is at least ¼ inch of silicone on all sides of a model. When making a mold by pressing the model into a bed of Silicone Plastique®, be sure the bed is thick enough to allow for the insertion of the model with ¼ inch to spare. These medallions are ¼ of an inch thick. Therefore, the Silicone Plastique® layer on the bottom is ½ inch thick ensuring a proper bottom once the medallions are placed.

The ½ inch layer of Silicone Plastique® should be level and even on the bottom of the container. Place each model coated side down, onto the layer of Silicone Plastique® making sure they are evenly spaced from each other. It is not necessary to press each model into the Silicone Plastique®. It is better to press all the models into the Silicone Plastique® at one time which is covered in the next step.

By pressing all the models into the Silicone Plastique® at once, the bed of rubber stays level as it is displaced by the models entering at the same time. To accomplish this, use another food storage container of the same size, place it on top of all five models and apply a steady downward pressure.

Silicone Plastique® has the consistency of clay and therefore in this situation, it will not hug around the models like a liquid. Even though the models were pressed down flush with the surface, you should manually press the silicone rubber material around the perimeter of each model to achieve full and level contact.

Silicone Plastique® usually cures in 60-75 minutes. Since parts A and B were refrigerated before combining, this mold took about 90-120 minutes. Test for cure by pressing the edge of a spoon into the rubber. If it springs back with out an indentation that is a good sign that the Silicone Plastique® has cured. Flexing the mold is good way to release the models.