Item #: DX533-QT. DX533 is a phosphoric acid-based cleaner, brightener, and pre-paint conditioner for aluminum. It is used to deep clean and brighten aluminum surfaces prior to welding, painting, or to prepare the surface for a subsequent chemical coating. DX533 is clear in color. Ships HAZMAT. HAZMAT shipping fees are $20 per box - 66 pounds (4-5 gallons) per box.