A new construction home nearby has the flat roofs done with resin over fibreglass cloth over plywood substrate. The builder’s onsite guy said they’ve used it for awhile, gets finished with a gelcoat just like a boat. I don’t think they’ve used it long enough to know how it holds up when the building settles.
I googled it and it looks like they use it in the UK, found one stateside reference in Utah. Anybody with any longterm experience with this?