If you coat your car in an ordinary polish, it will be covered with swirl marks and possibly an unsightly gloss or haze. By formulating their product with bits of carnauba (palm-tree wax) that are only nanometers wide, automotive cosmetics maker Eagle One says it's able to make a coating that always goes on clear.
Since the carnauba wax particles are tremendously small, they appear transparent. Their minuscule size also lets them fill the tiniest flaws and adhere strongly to paint. Sunblock manufacturers accomplish the same trick using zinc oxide.