I based it on what he said and by the looks of the roof in the picture he enclosed . :
Quote:
I'm guessing there are small cracks in the fiberglass.
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and with that said ... there would be no rubber on top of fibreglass unless someone added it after the manufacturing . ( which by the picture did not happen ) Gelcoat , yes , but no rubber .
And , IMO , that surely does NOT look like EPDM black rubber roofing . Appears to be either textured ABS or fibreglass