Grinding Process of roughing out large volumes of metal, rapidly, creating accurate dimensions Polishing / Buffing Steel, Stainless, Bronze, Copper, Brass, Aluminum Mechanical Glass Bead Blast Slower, gentler bead blast; produces a uniform, non-directional, low reflective surface. Sanding/Sandblasting Faster, more abrasive blast; removes metal contaminants and can be used to smooth or shape a surface