Weathering / shading UN white vehicles?

Further update and I think Ill add a pic or two in the next post if I can.

Using the Reaper Rainy Grey with the glazing medium in a rather thick wash, the gloss paint has been ever so subdued to a more convincing appareance..almost like a filter.

Since I had prepainted in spruce green, the grey combined with my sanding and chipping efforts and a minimum use of a 2hb lead pencil on the very corners where the unit would have to work its way through trees and scrub is turning out quite convincing. I have added hydraulic stains (  a washcolor called Flesh Wash that creates great hydro stains) I have been adding more tan to the grey towards the feet since they "live" in the dirt all day long. MIG pigments are next once I get it all assembled and can start handling it as a unit.

so, in all, i would like to say that the advise to use a neutral gray to shade and weather white was right-on! 

Quick update:

I am using Reaper Master Series (game paint, LOVE this stuff!!!) Rainy Grey (its nuetral grey) reduced with a few drops of water and AV Vallejo Model Color 596 glaze Medium. reduced to a glaze (very thick wash) it lays on and dries in a few minutes. 

I love the way the glaze medium works and it is giving the correct depth to the satin white paint. Glaze medium pulls the paint into the crevices even better than regular washes.  So far so good. when i get down to the feet I will start to add some Khaki or Earth into the grey mix for embedded dirt.

thanks guys, goign to grab the hannibal and finally settte down to the bench and get to work on this one! 

In addition to washes, if you have an airbrush a very light misting of flat tan, especially shaded more towards the bottom, makes a good dust.  Do the underside, and aim brush towards sides from the bottom.

Grey seems like it may just work, Paynes grey is far to dark, Nuetral may be the right ticket for this.

In the movie Patlabor2 (My old screenmane was patlaborunit1) the vehicles were sent to Veit Nam as part of a UN Peacekeeping force, but that was a ruse from a rival government corporatoin to set the manufacturer up for failure when the Labors were unable to cope with the high heat and humidity of the terrain.

VN red clay earth MIG pigments will be used, but not to the extent that we would see on, say, VN era gun trucks. I will keep it more restrained....The Hannibal Labors in the movie didnt last too long in service but they did see some light action. I may try some rain streaking as well from what I saw over at the MIG site.  Most of the photos I have found online are from UN vehicles fresh off thier transports, or of the white trucks rolling through towns with not too much dirt on them besides mud splashes. They SEEM to be fairly well maintained for thier environment.

thanks for the feedback!

I am unfamiliar with the movie or reference material you are talking about. But for the wash I would suggest using a neutral gray or perhaps raw umber in a dirty/dusty environment. Anything darker would probably be too stark on a white base color.