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I've used both non sag and self leveling on my Filon (fiberglass) roof and it works well. Most recently when I installed solar panels. I used it as a glue under the tilt brackets and around the screw heads. Also used dollops of it to secure the wires to the panels to the rooftop. It sticks quite well to the fiberglass roof.
Tom and Pris M. along with Buddy the 17 year old Siamese cat
1998 Safari Serengeti 3706, 300HP Cat 3126 Allison 3060, 900 watts of Solar.
Dragging four telescopes around the US in search of dark skies.