Taking the queue from the A-47 Airspeeder, I once again used a Testors spray for the base coat layer of the model.
So many things in the Star Wars universe are some variant of that "spaceship"-looking gray, it comes to just varying those grays between different models so that they don't all look the same.
I found Testors Flat Gull Gray and their generic gray primer to be very useful colors for base coating Star Wars Legion miniatures.
It really comes down to either starting with a darker gray spray and then painting your lighter grays over it with actual brush strokes with a large brush, or starting with a lighter gray spray and then applying a wash over it, then doing a highlight layer.
I opted for the second option. I still have to master getting smoother, military-looking finishes. I guess that doing things like actual military planes and vehicles like fighter planes and tanks probably involve the use of an airbrush to achieve that super-smooth looking finish you see on modern craft.
But since I don't own an airbrush, my next best option is to use sprays for base coats and then rely on my own shading and highlighting skills.
My AT-ST has a VERY simple palette. It was nothing more than the Flat Gull Gray spray as a base, followed by an overall wash of Citadel Nuln Oil over the entire model, with a lighter gray highlight over it. I took care to make sure that the wash didn't pool in certain areas, and wiped away any excess as I was doing it. When the Nuln Oil was dry I took Vallejo's Game Color Stonewall Grey and carefully drybrushed the whole model with a really soft brush to achieve as smooth and gradual a highlight and color gradient as possible.
Overall the results are pretty good, I think as good as you can achieve with rattle can sprays. I am considering however finally investing in an airbrush for upcoming military model projects.
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