Progress has been kinda slow as we've been busier than a one legged cat burying a turd around here...
But I finally got all the old seam sealer out of the drip rail "ditch", and then wire wheeled it, and gave it a good dousing of Rust Mort. After it sat for a week I masked it off yesterday and hit it all with some self etching primer. Will do one more coat of primer before I start on the self leveling seam sealer.
I bought self leveling sealer from 3M, and an applicator gun made by Cox Industries. Got it all off of Amazon. I'll report back when I have the area sealed up. I looks like I'm gonna have to raise the rear of the truck to make the front edge of the drip rail "ditch" fairly level. The pinch weld is towards the front, and I want the sealer to stay over the seam instead of pooling at the back along the roof line.
Gary