You can use a thicker paste of putty for mud that has built up onto wheel wells and tires. I have also used celuclay that is mixed and kneaded till its smooth. Add some white glue and this will give you nice mud effects. As for the splattering you can take your mud colored paint and use the tooth brush or stiff bristled brush and "flick" your mud colored paint for splatters. Once this has dried you can use a thinned paste of plaster, colored to match your mud. This will build up and give you that desired "bogged on" mud look. Take it slow and let it build up for the best effect. But don't doddle. Plaster sets up pretty quick once it gets started so be aware of this. Clean up your tools and work area (and don't wash them off in the sink, take them outside to clean them up otherwise you'll be paying a pretty hefty plumbing bill).
The celuclay works nice, because like any mud, there is always some sort of ground detrius mixed up with it. Grass, roots, etc. The paper fibres in celuclay replicate this very nice.
Depending on the "weather conditions" you can also use a lighter shade of mud in the thinner areas. This replicates mud that has dried. The closer to the ground or the closer to the built up areas the wetter it will be, so add some gloss to it.
Don't forget to muddy up the lower parts of the pants, knees, boots etc. of any figure you may add to the scene.
Mike
Mike
"Imagination is the dye that colors our lives"
Marcus Aurellius
A good friend will come and bail you out of jail...but, a true friend will be sitting next to you saying, "Damn...that was fun!"