Papier mache recipe
Note the use of Copal Varnish for waterproofing.
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The colors are protected against atmospheric influences, and made to shine with greater brilliance, by 2 or 3 coats of copal or anime varnish. Superior articles receive as many as 6 or 6 coats of varnish, and are finally polished.
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I'm available as an editor.
Fiberglass? Don't breath the fumes.
My suggestion would be Polymetal.
It's rigid, so you could cut pie-shaped pieces and roll in the curvature, then rivet it together. Most importantly, it's
prefinished.