ATM PVC expansion-a solution?

["Andersen, Clark R." <clanders@utmb.edu>]

To get around the problem of PVC tubing sagging, consider wrapping the tube
in a layer or two of epoxy saturated fiberglass.  This will add minimally to
the weight, yet dramatically improve the stiffness.  Conceivably (with a
little forethought) a PVC tube could be used only as a mold (configure it to
be disassembled from the inside), coated with a release agent, and a very
nice, stiff, lightweight fiberglass tube formed around it... as many as you
like.