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wrote:

i'm out of date and i want to not layup a bicycle chain cover. one
suggestion was using window screen covered with foil. The idea led to
wondering if a fiberglass fabric was currently available that would
bend into shape and hold the set for resin, as window screen would.

does such fabric exist?

NTTBOMK

Cut a form from old styrofoam, cover it with plastic sheet, drape
with glass, laminate with resin.

Or, use wire window screen, bend into shape, paint with resin, cure
and then add a layer of glass, or not, and keep the wire screen as
structure, sealed inside.

You could also cover a wire form with plastic sheet basted on with a
needle and thread, etc.

Terry K