Finsher building my 6th model a Jagdpanther by Tamiya. Reseached on you tube and came up with 10 way to weather track. So i will post this to see what has worked for you. I tried, mixing plaster with pigment, I have AK dirt and deposit and their Mud kits which is strictly a wash. Tried mixing the K washes with plaster and pigments. Tried splatter effect with airbrushing wash to create splatter . But nothing seems to work out as well as I hoped.
so what works for you— yes spray a light coat of NATO Black and Red Brown. On the track, but slo noticed by weathering the track off the model and then trying to place to track on the model I lose half the effects.
Splatter, Clog, Clean Nozzle, Repeat!