Preston. To answer your question on weathering your armor, what I did was use black eyeshadow compact, and a blush brush. Just rub the brush on the eyeshadow, and simply brush it on your armor as if you are "drybrushing." You only need very little eyeshadow on the brush. A little goes a long ways, and just repeat over the entire armor, helmet, and boots.
My belt is somewhat weathered naturally(I never clean it).
I did not seal my weathering so I could wipe off all of it when I wanted to. Meguiars Rubbing Compound took the eyeshadow right off with minimal effort. I am sure Novus polish would do the same as well.
Take a look at my build thread and HWT Centurion app to get a glimpse of what I did and how I did it.
It is super easy to do!