Armor wheels against dirt and brake dust! Gtechniq C5 Wheel Armor forms an outer shield over wheels, making them dirt and brake dust repellent as well as being much easier to clean. Independently proven to outlast other rim coatings, Gtechniq C5 Wheel Armor uses a unique chemical bond to become the functional surface of your rims a single application lasts up to one year. Brake dust is detrimental to wheels. It heats up and penetrates the wheel finish, causing pitting and stains. Wheel protection is vital to maintaining the beauty of wheels.