wheathering my M1

Are those your builds?

ANyways, most of the effect here was acheived with a dustcoat, I'd say, rather than drybrushing.
Anyways, basically, a drybrush is used to bring out the raised details and edges of a model, and is complementary to a wash.
Let's say you use an Olive Drab basecoat. For that, i'll usually mix OD with a little bit of black to darken it, dilute it a lot, and apply the wash. Once dry, I'll take the basecoat (OD) and mix in a lighter colour, like a drop of white, or something like that. This is not diluted in any way. Dip your brush in, and wipe it on a cloth until there is very little paint left on it. Then LIGHTLY run the brush over the raised details of the model, and all edges. Very little paint should be applied, and will in effect be 'feathered' onto the model, bringing out the raised details.
The above models went one step beyond that and were dusted. I usually apply a dustcoat with an airbrush. If you have one, a good colour for dust is Tamiya Buff. I make a mix of approximately 1 part paint to 4 parts water, so it's very thin, like a wash. Then I 'mist' this mixture over the whole model, applying a heaver coat over the running gear and lower parts of the model, where dust accumulation would be greater. If you don't have an airbrush, you can dust your model by using chalk pastel (you can buy them at art stores or even your LHS, if they carry them). Grind the chalk pastel on a piece of sand paper till you have some dust. I usually place this dust in a water bottle cap for easy storage and usage. Take a soft bristle brush and gather some dust onto it, then just spread it all over the model, again, focusing on the lower parts and running gear.
You may want to post on the Techniques and Painting and Airbrushing groups, as I'm sure people there have links to guides. I have some, but for the life of me, I can't rember, and I don't have them bookmarked here at work.
Good luck. DOn't be discouraged if you don't like the inital results, just keep practicing

thanks zokissima that should help I did post in the other forum to get a few more imputs so far yours does make sence to me thanks again now I gotta find some scraps to be the guine pig hehehe

I do the same as Zok but without the airbrush{dont hav 1} and the effects r great. U could if u like splash a bit of mud on it. Muddy afv's r cool.
Here is my Merkava with pastels and under it my muddy deuce.


Keep well.

I spent 21 years in tanks and I think people often over weather vehicles. Yes there are times when it is ok. I remember three tanks bogged to the finders when we discovered an undergroung stream near the surface. 99% of the time a LIGHT coat of dust is approperate. In desert storm my tank was usally quite clean with no help from me. Think if I am moving across the desert at 30 mph collecting dust, I also have a 30 mph wind to blow it off. Oh yeah the rubber track and road wheels do not turn gray. The edge near the roadwheel rim are often over sprayed with paint unless the vehicle has spent some time in the field. Diesal stains near the fuel cap are another story. they are almost always there.