I am now at the stage where I want to weather proof my observatory roof. Its
an octagon pyramid and I need to keep it as light as possible. Its made of
6mm exterior ply and I am looking for off the shelf suggestions to
weatherproof it. I don't want to use varnish.

I have been wondering if I could use some kind of bitumen paint with the
fibres in, not sure what its called but its used to coat or mend flat roofs.

Any suggestions please
Thanks
Steve

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