Just a quick test shot of the leg plates blue-tac'd onto the painted leg. Techniques after the break!
The legs were primered in Army Painter Black and then had a fairly large amount of Army Painter Gunmental drybrushed onto them. The important take-away from me using this technique was to get an even amount of the Gunmetal on the surfaces that I wanted to reflect the color of the wash I would apply next. Where this became a bit difficult to envision, was the need to get more of the drybrushed paint onto the larger assemblies on the back of the Knight's legs. If I didn't do this, then only the highest, most detailed points would take the wash color. I had to balance this against just basecoating the entire model in Gunmetal, but that would have taken away the depth created in the drybrushing, and I would have had to add it back via a dark wash on top of the color wash! It is all a tradeoff, here is what that first drybrush coat looked like.
After the drybrush coat dried, I hit it with a fairly liberal amount of Army Painter Blue Wash, which when allowed to dry looked like this:
Unlike my Inquisitor where I put several coats of blue wash on in order to darken the tone of the material, here I stopped after the first wash. The intent was to make it look like an unusual, energized metal, something different than the usual Imperial Knight silver-and-gold frame.
Here is both steps of the technique side-by-side: