On Sat, 25 Sep 2004 17:48:37 +0000 (UTC), "Steve -
www.ukspeedtraps.co.uk" wrote:

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.

Steve

Ron Johnson's ply dome that I designed at
http://home.freeuk.net/m.gavin/rondome.htm
is 'weathered' with flexible epoxy paint and after two years is still
perfect. It's much lighter than old fashioned bitumen.