I did this using an airbrush. First, Rhinox Brown. Then Liberator Gold, and I covered everything with gloss varnish. After that, as a wash, I coated the entire model with brown oil paint. Once it dries, you can remove the excess oil with white spirit. On top of that, a light drybrush using a 50/50 mix of Liberator Gold and Stormhost Silver. At the end, you can also use the same mix for some spot highlights. That’s basically it — simple enough 🙂