Wet effect is familiar in nature, e.g. water seepage rock face of cave. There are several shaders for wet effect, but only static mesh can use them in Awakening, because only static mesh contain vertex color. The wet area is indicated by vertex color's alpha value ( more small more wet ) . When you select a static mesh in Editor, you can click the Brush Setting rollout to paint alpha value of vertex color, set a big Step and select Descend to decrease alpha and get wet effect.