Typically, materials used for pattern making are wood, metal or plastics. Wax and Plaster of Paris are also used, but only for specialized applications. Sugar pine is the most commonly used material for patterns, primarily because it is soft, light, and easy to work. Honduras Mahogany was used for more production parts because it is harder and would last longer than pine. Once properly cured it is about as stable as any wood available, not subject to warping or curling. Once the pattern is built the foundry does not want it changing shape. True Honduras Mahogany is harder to find now because of the decimation of the rain forests, so now there is a variety of woods marketed as Mahogany. Fiberglass and plastic patterns have gained popularity in recent years because they are water proof and very durable. Metal patterns are long lasting and do not succumb to moisture, but they are heavier, more expensive and difficult to repair once damaged.