I've always gone with the Dicor. I understand it and it goes well with the roof.
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
2017 3500 Dodge Maxi DRW 4X4, Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, etc.
I replaced our sky-light once, I moved to the other side of a country road to go around a jogger and hit a low tree limb! I guess that was much better for the jogger!
I vote Dicor for the finish sealant. I really like how it self-levels after applying.