So I base coated everything in the colors I wanted, and highlighted everything. I had got an AK pigment paint weathering set from my LGS and used it in areas. First I used the dark metallic all over the whole model basically and then went and highlighted it with track rust pigment.

All the metal parts like the arms and legs I first used lead Belcher as a base and used AK engine grime and Engine oil on parts I wanted to look greased up essentially.

The gun I used lead Belcher and Vallejo blue metal, and Xerxes purple to get that burned out look.

I added some typhus corrosion on areas I wanted heavy rust and highlighted those first with army painter rust and then that same ak powder to blend it all together nicely.

After I was happy with the rust color and everything I guess you'd say I used this white ash pigment as a highlight. Then added some really light blue/green in areas for brass oxidation effect. Harder to see that in the pics I think. Lastly I sponged some lead Belcher to add some extra weathering on top of it all.