Winnie Customer Contact told me any 100% silicone.
Prior to that one someone else's advice was to use a self leveling product like Dicor. Didn't last and it wasn't easy to work with on the side roof seams. Re did the job with Silicone and have had good luck since.
"It's always wrong, everywhere, for anyone, to believe anything beyond insufficient evidence" -- William Kingdon Clifford
John (N9MXX) & Derek (KC9KEM)