Probably the best way Butek isto do it yourself, maybe on an old model or a wing of a plane model, you can do it with any thinned paint or water color. take a picture of the wing with say a base color on it, then do a wash and compare the two, it well give ya a good idea of the difference one makes. O yea you can use Rust-All which ya can buy at yer hobby store if ya aint got any already, it comes with a thinned wash, and i found that the rust looks cool on german winter camo for panels and such...maybe i should get pictures of that model up some time....