RV LIFE Forum Hub, Wander The West
Roof panel edges.
My 2017 Fleet has it too, I spoke with Aaron at FWC, he said that the roof panel wraps over, then the trim is put down over it with butyl tape (I think that is what you are seeing), then the white sealant is urethane caulk for a nice finish. He said it was not going to leak, so I am leaving it...