Sweaty / Oily look?

in New Users
Does anyone know of any way to make characters look like they are sweating, as if they have just been running, or oily as if they've been in the shower?
Either by using photoshop or a daz product? If daz, preferrably for 3delight but iray is fine
Comments
Just search wet in the store
http://www.daz3d.com/catalogsearch/result/?q=wet
Does anyone know if this product significantly increases render time:
http://www.daz3d.com/genesis-3-female-s-wet-body-iray
PS - I use this product every day for the Environmental Lighting Presets. But it also has an Oily Skin option that works nicely.
http://www.daz3d.com/light-it-up-iray-lights
Where are those shaders? I've read that Iray - water, water thin, and water dispersive shaders come with Daz Iray, but I can't find any of them. Did I miss an install file?