Dan - neat PE work on that wagon
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Wayne - very detailed weathering on that frame, looks great!
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Mike - textbook application of the pre-shading, but really like how you've varied it with the airbrush.
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Don - PzIII looking great, and nice workmanship on the scratchbuilt fuel rack. The brown camou you've applied is not the colour prescribed by the tropical scheme directives, but you never know, the crew (or field workshop) might have found some other paint to use instead.
If you are looking to apply a wash to lighten colour, you might have to look at a concrete colour or light sand/dust. If you don't have any of the Florys wash products, you can mix your own using a light coloured weathering powder, a drop of dish soap and water. The added benefit of doing this "dust" wash is it accumulates around recessed detail.
I'd suggest practicing on some scrap first. You can also wipe off before it dries to get a sort of streaked effect, like I did here with my Tiger build:
regards,
Jack