Technological advances have improved the process of polishing precast, making it an attractive alternative to natural stone panels. The main advantage to polished precast is that it is a moldable product, and more flexible than stone panels. Precast does not have to adhere to the size and shape limits of stone and can easily be created in repetitious patterns. Precast offers more control over color than stone, and can feature multiple textures on a single panel. Polished precast can also be used for outdoor pavers, which polished stone cannot. Production of precast pavers is cost effective and requires only one additional full-time operator. Other initial investments include molds, an automatic polishing machine, arrissing equipment, tooling and sundries. Additional investment would be required for edge or curve polishing. The mold is probably the most important part--it must be as flat as possible to save time and effort in the polishing process. A granite aggregate is usually the best suited for polished precast because it will hold its polish for years to come.