How can I achieve a professional finish when buffing a polyurethane floor?

To achieve a professional finish when buffing a polyurethane floor, start by thoroughly cleaning the floor to remove any dirt or debris. Use a floor buffer with a fine-grit sanding screen to lightly sand the surface of the polyurethane. Then, apply a fresh coat of polyurethane finish and allow it to dry completely. Finally, use a high-speed buffer with a polishing pad to buff the floor in smooth, even strokes until you achieve the desired shine.