I really can't because my weathering is very inconsistent. Also, it's either hit or miss, some projects turn out great while others look like crap. I need to work on some kind of a streamlined approach to weathering then I could do a tutorial.
Here is the site for mig's work. His section on pigments will have info on using powders. It should be noted that the translations are a little rough, but the work speaks for itself. http://missing-lynx.com/rareworld.htm
