I see what you did up there with those Chickens.Cluck cluck!
If I had a fiberglass roof on a WBGO made when yours was, I doubt i would have any need for Eternabond on it. Your roof is permanent... my TPO roof is temporary and basically a consumable. It will need replacement LONG before the shine wears off your fiberglass!
So... don't do it. I wouldn't!![]()