Weathering Panzer Grey

One easy weathering technique is to either lighten the Panzer Gray, or else use a white or very light gray, mix quite thin, dial the paint flow way back on your airbrush, and put on a very thin almost-transparent coat on upward facing surfaces.  This simulates paint chalking from lengthy exposure to sunlight.  Do this after decals are on- it also fades the decals a bit.

I use the oil paint dot technique using greys, white, greens browns and blues and even some yellows. Once blended and most removed from the streaking process, you will have varying tonal changes in the monotone Panzer Grey scheme. This method creates rain water marks, grime and fading.

I would go with some dot filters useing oil paint, this will give a streaked apperance, and then some dust effects. I use AK products and MiG pigments, but you can get good results with tamiya buff.

Hello!

This one used to show really good how to do it:

http://cs.finescale.com/fsm/modeling_subjects/f/3/t/164179.aspx

Unfortunately the pictures had been ransomed by P-Bucket. But maybe you can still get some info out of it? Hope it helps, have a nice day

Paweł