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Plaster of Paris is typically mixed with water to create a workable paste. When the dry powder is mixed with water, it rehydrates over time into gypsum. The setting of plaster slurry starts about 10 minutes after mixing and is complete in about 45 minutes. The setting process is accompanied by a slight expansion of volume.Plaster of Paris is commonly used for:Casting molds for crafts, sculpture, dioramas, and home decorGeneral wall and ceiling repairMixing DIY chalk finish paintCreating decorative items, such as ornaments and figurines