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Feb 7, 2023 · Measure the plaster. For a basic mix, use 2 parts plaster to 1 part water by volume. For example, 2 cups of plaster to 1 cup of water. If you need a larger batch, increase the amounts accordingly. Pour the water into a mixing bowl. Slowly add plaster to the water, stirring constantly, until the mixture reaches the consistency of a watery paste.
Sep 18, 2023 · Pouring and demolding the cardboard mold. Pour the plaster into the centre of your mold and gently shake or tap the mold to get rid of any air bubbles. When the plaster of Paris sets it gets quite hot. It usually takes about 30 minutes to an hour depending on the temperature.