Plaster of Paris is a white powder made from gypsum that, when mixed with water, becomes a thick paste. The paste dries relatively quickly and is used in craft projects. It easily forms moulds or sculptures that become durable as the plaster hardens. The finished project is usually then painted. Making bricks from Plaster of Paris is a relatively simple process.
Calculate the quantity and dimensions of the bricks you would like to make. Knowing the exact dimensions will help you determine how much Plaster of Paris to mix up.
Measure out equal amounts of plaster and water using measuring cups. Allow the mixture to soak for several minutes before stirring with a spatula. The quantity of plaster mixture will ultimately depend on how many bricks you are making.
Form the shape of the brick with your hands. You will want to spend no more than 10 minutes on each brick because Plaster of Paris begins to dry out as soon as it comes in contact with air. Use a measuring tape to ensure the brick is the appropriate size.
Smooth the edges of the brick with a nonserrated knife. Place finished bricks on a sheet of waxed paper, and allow to dry completely, which may take 45 minutes to one hour, depending on the thickness of the bricks.
Leave the bricks on the waxed paper for 24 hours if you are planning on painting them.
Allow any leftover plaster to harden in the disposable bowl, and then throw it away. Never pour plaster down the drain, as it will damage your pipes.