Joe, I can't thank you enough for the great description. It all makes perfect sense ! The Matte Medium I have on hand is dead flat and dries clear, layering on different color pastels/powders creates the different shades of rust.
Dabbing or stamping with different size brushes is a technique I use frequently to prevent obvious brush strokes.
I really like the use of the blade edge to simulate scratches, great idea again.
Hey Dave, yes we should get together, I need help putting Kadee's on one of my TMCC 0-8-0 Yard Goats,