So the 1500 was a wet sand. Are the 2000, 3000 and 5000 dry or wet?
I want to make a bead on the outside encompassing the painted metal, rubber and glass. That's what I did before the resto and it worked well.Black polyurethane caulk
I’m working on the interior roof on my Travelall. After I epoxy prime it - I intend to pull the back glass and treat the rust back there. I have the same new gaskets that you used. My thinking is that I will mask the exterior area, put a thin bead of black polyurethane caulk around the gasket where it pushes against the exterior and then reinstall the window and gasket.