If you are trying to create 3d models with wet skin by adding the wet look in post work then I would suggest doing it in the 3D program instead. There are a few good wet skin addons around, I use wet bodies for M5 V5 which is pretty good. If you are attempting to create your own wet look skins then I would just search for some free water effect brushes rather than trying to create them with such a function restricted program as PSE. There are lots of free brush sets on offer, Deviantart is a good place to start your search.

Just my 2cents worth.