Yeah MAG, that's the first reason I didn't get it. The second was zimmerit.
Here are the atest progress pics on my tank. I went for some colour fading and other stuff with the oil paints. I've 'overdone' the effect somewhat to accommodate later weathering...
Paint 2.jpg
What I did was to mix up some oil paint of a similar colour to the base. I then had a range of oil colour from darker than base to nearly white. I applied some blobs to an area and blended then in with a soft brush.
Here's the result not quite finished.
Weather 1.jpg
Weather 2.jpg
Weather 4.jpg