I have read a number of articles regarding weathering and mud and all that. However I am still a little confused as to how to make mud. In a number of articles they say use dirt from my back yard, other say use pigment, resin and plaster. Would some one give me a tried and true method of achieving this effect. I know that in the long run it is going to be up to me and the look that I want to achieve, but I really don't feel like reinventing the wheel if you get my meaning.

Thanks for the assist

Randy