>>6061058>>6061075For primer I use Vallejo, but whatever you find useful is ok. Now for the interesting part of the questions:
You can use a wash/pigment labeled "brown for German yellow" in a Syrian t-72 or in a gundam whatever because, while it's true that is a color that's engineered to work with the dubkelgelb and give results 100% of the time, in the end is just a color/pigment.
What you need to have in mind while choosing washes, pigments, streaking effects and stuff related to weathering in general is "where is my afv/plane/ship/robot/car deployed/used?" And then work from that. So if I've understood what you said, is that you have washes and pigments for modern USA afvs? I suppose that those are for Irak/Afghanistan theaters so desertic. Is your tank in the desert or painted in sand? If yes feel free to use what you have (a pic or better description would be better, but as a generic answer is good enough) and if not you need to buy/""""""make""""""" others.
99% of the Russian post ww2 afvs are painted in green so what you need overall is a dark brown like
>>6061493 said, and for the pigments buy "Russian earth" which is a very dark brown and some "European earth" which is lighter and depending of the brand more greyish or more brownish, but what matters is having some tone variety that fits the operation theater.
Filters would be nice also, there are for "x vehicles" labeled too but with them you have more liberty, for example you can use a red filter to give your green a final brown hue.
Also check a.mig Kursk soil if you need something like that, is a slightly textured enamel for dust deposits (not the same as washes) and gives a nice contrast to the model if it's based in Russian summer or dry environments
Pic related would solve all your needs in soviet (and overall green) afvs, but they are enamel (unlike Vallejo washes)
>>6061494>>606153750€ for a whole encyclopedia that you want and will teach you stuff you need/want isn't a lot really