Making a concrete statue involves making or buying a mold, applying a release agent, mixing the concrete and filling the mold. When the concrete is dry, release it from the mold, and file away any rough edges. Finish the statue with paint, or allow nature to age it.
Commercial molds are available in rubber, fiberglass or cast aluminum. Use natural latex or rubber-like products to create a mold by building a model using modeling clay and painting several layers of the material over it, allowing each layer drying time before applying the next. After finishing the mold, cut it in half to remove the model. Prepare the mold for pouring by coating the inside with a release agent. Close the mold and provide adequate support for the weight of the concrete.
Mix the concrete following the manufacturer’s directions. If adding sand to the mixture, keep it wet while mixing to prevent the formation of air bubbles in the concrete. Once the concrete reaches the desired consistency, pour it into the mold, tapping and squeezing it to prevent air bubbles. Many commercial statue makers use a vibrating table to ensure the mixture flows into all the small openings of the mold and that all air bubbles rise to the surface.
After the concrete sets, open the mold to release the statue. It is likely to require filing at the seams of the mold and around the base.