So… neither had I. Though I have seen it suggested. I won’t swear by the result since it’s not dry yet but, I tried it. I think I need more oil paint in my wash next time. I used Abteilung Engine grease paint and mixed in green earth pigment from secret weapon.
I like the pigment deposition for generalized grime. I’m planning on doing a bunch of washes over this with regular Army painter washes, sponge weathering etc but it looks Ok. Just ok. I wanted way deeper color so I could use reductive shading. It’s an experiment.