Pre shading Abrams

I know a lot of modelers pre-shade WWII armor by airbrushing black or another dark paint over the edges of the armor plates and an the panels before applying the base coat to show the depth of those areas. I don’t know if I should do that on my Abrams I am building or just apply the base coat and then wash and dry brush? Does anyone also have other ways to weather. Another question, I have read to show fading, you spray a mist of a lighter tone base coat over the top of the tank. How do you exactly do this? How do you do dusting effect? I read that you have pigment on a brush and blow the pigment off with an airbrush. Exactly, how is this done?

Sorry for all of the questions lol. I am a navies.

Ken

On sandy yellow vehicles like the Abrams I like to use a dark brown as a preshade coat and something like a khaki drab or olive drab thinly mixed for a post shade. It’s a real dingy colol which is good if you wanna show grease/grime streaks.

With fading you tint the base color with a little white to give a lighter tone, you also tint a the base color a little bit for drybrushing so the details show up. You can tint the base color a little bit and spray along panels to modulate the color to simulate light reflecting off the surface or you can spray it in patches to simulate faded paint or ground crew resprayed areas.