How do you polish aluminum to a mirror finish? Check out this incredible technique that involves spraying the metal polishing bar compound on to the work piece. To polish aluminum to a mirror finish using buffing wheels and polishing compound, start by preparing the aluminum surface with sanding discs to remove porosity and scratches. Next, attach a buffing wheel to a bench grinder or handheld buffer. Apply a small amount of aluminum polishing compound to the wheel. Gently guide the wheel over t