Dragon, the mud on the Tiger is a product from Liquitex called Stucco. It is basically an acrylic modeling paste with very fine sand mixed into it. It goes on white in color, but dries clear. I apply it before I do an painting and then paint over it with the vehicle color. Normal weathering process after that. As to the camo pattern on the PzIII, I just cranked the nozzle on my Badger 150 down and thinned my paint a little more than normal to get a tighter pattern. The rest is just a steady hand. "Q"
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Same technique for the mud on the ISU-152 as well.