ok....looks like i opened up a whole kettle of worms here...lol
Right.... i never tested this on V3, but im guessing some of you have already found this works, as well it should do, as i managed to cover V4 and her hair with pretty good results...
I will have to do a nice little download of the file for you all. i shall post it monday night and warn you all here that its available....

As for textures.... you dont have to use a texture,you can leave that node out (as well as the bump map texture)...and you dont have to use a skin texture, you can use a tartan cloth texture if you wish...lol, this makes it more of a node that allows you to cover everything everywhere with mud....

Now.... for hborre questions, Mud drops are controlled by the Granite_3 node and the clouds node (not numbered).... some of you might notice this as the mud drops appear on in renders not in preview so they are connected to the Displacement node....which brings me neatly to any Newbies out there.... TO GET the most out of this shade you have to have DISPLACEMENT on in the render settings...
Splatter intensity.... phew trying to remember this of the top of my head...lol.... now without going back into poser, play around with the various cloud nodes as these place the splatters in different splats and (A big AND) seperates your texture from mud...
as for the RGB values you can play with them to your hearts content on monday with the shader download that i will make for you all....ok...

Oh and a little tip folks.... im a newbie at the shader room too, i just decided "Thats it im gonna get this to do what i want" and one day and 5 shaders later....one finished mud shader....
so please go easy on me folks....im no Bagginsbill, lol
Oh and believe it or not this shader does sand too, but it needs fine tuning....

Have a good day everyone and thankyou all for your interest, please look back here monday and you shall all have your shader download.

Shedofjoy

Thankyou again all
 

Getting old and still making "art" without soiling myself, now that's success.