At about 24 seconds in, Duncan calls out my name in response to 'How to Paint White Scars Power Armor'. This is really good 'primer' video for painting white armor.
You could always cut a step and airbrush the armor in Ulthuan Grey as well. Then proceed with the wash into the recesses, mixed with acrylic medium, followed by the white edge highlighting. The main point to remember is, always water down your white to avoid the clunky, chalky look that can happen when it is too thick. Multiple coats of a thinned white will work.
Meanwhile, I should be getting back to painting soon. The excess work on the house is still not complete. The guy that will be doing, will not be available until January. Until then, I have reset part of the room to allow for some work to be done until then.