Aw man that doodlebug disaster was gnarly!
Thx Ed, I just masked it off with blue tape. I cut strips with a straightedge to match the height of the windows, laid them in and trimmed the other edge with an X Acto. Notice I didn't do a perfect job. A couple PBRs seemed to help speed things up a bit.
Weathering was a light coat of MM flat clear acrylic, followed by an acrylic black wash. I then puffed a bit of Grimy Black onto it with a bit of RR Tie Brown on the running gear and some Rust on the couplers. It is sitting here with flat clear/wash treatment in this pic: