Polishing is a finishing process through which to smooth the surface of an object using an abrasive or a work wheel, generally used for enhancing the appearance, prevent contamination, remove oxidization, and increase the reflectivity. Technically, polishing is different from buffing as polishing uses the abrasive glued to the work wheel while buffing uses the loose abrasive applied to the work wheel. Usually, the polishing process utilizes a pad containing the fine-micron or sub-micron abrasive particle in combination with a liquid to generate a reflective surface. The goal of polishing is not to remove large amounts of materials, instead, just very little materials will be removed to create a smoother surface. The condition of the metal before polishing determines what kind of abrasive is required to achieve the desired surface. Polished aluminum die casting parts and metal casting supplies can add a protective layer like wax, oil, or lacquer to prevent further oxidization and extend the service life. When an unpolished surface is magnified thousands of times, it usually looks like a succession of mountains and valleys. By repeated abrasion, those “mountains” are worn down until they are flat or just small “hills.” The process of polishing with abrasives starts with a coarse grain size and gradually proceeds to the finer ones to efficiently flatten the surface imperfections and to obtain optimal results.