How Could Superman Lift the Oceanliner Out of the Water While He Was Surrounded by Kryptonite?

In Superman Returns (2006), Lex Luthor creates a chain reaction where crystals take on the biological makeup of Kryptonite (under the ocean) which quickly reaches waterlevel and destoys the Oceanliner. Superman comes to the rescue, but the Kryptonite Crystals don't seem to bother him until a bit later when their exterior coating starts to fall away. What is this coating (that can mask the effects of Kryptonite) supposedly made of?...Read more