When particles interact with an object they can leave marks on its surface creating an effect as if the object was wet. RealFlow provides an easy-to-use method with several options for adjusting the strength of this effect and the maps' drying speed. Before you can start to wet your object you have to make sure that it has proper UVW coordinates applied. This is something that has to be done inside your 3D application, because RealFlow does not offer any ready-to-use tools to manipulate texture coordinates.
Result of the tutorial (the fluid is not visible here).
...