Hey guys, this is a weathering technique I use, I made it up...
Are there any powdery dirt areas around where you live? If so do the following:
Take some and put it in a bottle with a plastic cap
Poke three holes in that cap
For just dust, simply pour the dirt over the model in big piles everywhere and brush it off, repeat until result desired is reached
For a dirty look, or to make it look like it has been getting dirt splashed on it, do this:
Take some flat coat(from a bottle is nessacary),this will act as an adhesive for the dirt,and brush it all over the horizontal spots of the model
Now pour on the dirt in big piles,brush it off immediatley, when the flatcoat is dry, the brush strokes will show up, leaving the take looking like it has been traveling, so brush the dirt in the correct direction that the dirt has been traveling on the tank, because like I said, you may not see it when the flatcoat is still wet, but when dry, dirt "streak marks" will show up in the direction you brushed it off
Now for dirt buildup:
Start by putting on the flatcoat in the areas where dirt would build up(I.E. fenders, front glacis,bottom of rear glacis....)
Now put dirt on again over the flatcoat
Brush the dirt very LIGHTLY in the direction it would be splashed onto the tank(exceptions would be the rear glacis ONLY)
For dirt on the tracks simply repeat the flatcoat method described above
This method is pretty much permanent(I tried to get some off with water....)so practice on a peice of painted plastic first!
I also used a stipling motion to get the effect seen on the vertical sides of my tiger 1
This is pretty much a weathering technique that I made up as I went along, and I have perfected it since I started doing it, it is actually very, very easy.It is also practically FREE...
Here are some fine examples of the results of my technique
This is heavy dusting with light dirt clumps in certain areas
Heres the "streak mark" method
Heres the result of "packing" dirt into the tracks, I feel it makes them like they are clogged with dried mud. In the background can be seen the extremly heavily weathered StuGIII.
Heres a good example of the stipiling motion (done with a brush) used to simulate dried mud
Heres another example of stipiling, this time on the front
This is the result of this technique put to extremes, the flatcoat works like a charm!
These last two pics show the stipiling motions results
Heres the whole parade! http://photobucket.com/albums/b296/Kingtiger222/
I hope you realize that those are models I have done and that the above mentioned technique does work. I hope you use this technique to your advantage.
Happy modeling!