I've had a bit of a detour in the weathering. My plan had been to complete the weathering, then spray a final matte coat over everything, to kill the previous gloss coat and seal the weathering. My friend Eric recommended I test that plan first, since the flat coat would affect how the weathering looks. I realized that too, but didn't think it would make a big difference. Boy, was I wrong

. Once I sprayed the flat coat on a test piece, the streaking all but disappeared.
So, I changed my plan. I'll spray the overcoat first, then do the streaking and mud, and leave it uncoated. Here's what the tank looked like after spraying it with Alclad Klear Kote Matte lacquer, just heavily enough to kill the underlying gloss coat:

Streaking? What streaking?

And here it is one more time, after redoing the streaking. I had to change my method because of the flat coat. Instead of using water with a drop of Windex to break the surface tension, I had to use a drop of Dawn dish washing liquid. On the flat coat, the Windex mix just beaded up and wouldn't spread out, but the Dawn worked just fine.

Now that I've got that sorted, it's on to the mud, using Vallejo European Thick Mud and Splattering Mud. First, though, I'll need to experiment to find out how to do the bottom of the tracks, so I don't stick the tank to my workbench. Plastic food wrap or parchment paper should do the trick and peel off afterward.
Thanks for looking!
Peter