One solution that I have tried on a smaller scale. Slit the PVC pipe down
one side on a table saw. The pipe should close up a little so the kerf will
be a little less than 1/8". Cut a strip of 3/16 or maybe 1/4" polyethylene
sheet maybe 1/2" wide and fit it in the kerf so that the edge is flush with
the pipe's outer diameter. That will expand the pipe over it's normal
diameter. Wax everything and spray on a couple of coats of PVA mold release.
Mist coat first then a fill coat.

Wrap your glass. If it is uni-directional, diagonally in both directions
then straight once or twice then a top ply of woven on the bias. If you are
vacuum bagging you have to pull all the diagonal and bias plies TIGHT and
tape them well or the fiber will bunch up as the bag pulls it down.

Once it is set up, knock out the poly strip out of the kerf and whack the
outside of the tube lightly to break the release agent and let some air in.
The pipe will spring back to its original diameter and drop out. If it
still sticks soak it in water to dissolve the PVA.

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

"Garland Gray II" wrote in message
...
If I were to wax the outside of a piece of 2 1/2 inch pvc pipe about 6
feet long, and then lay up several layers of fiberglass and epoxy, would
the resulting tube slide off the pvc easily enough after curing ? Or would
I need to first wrap the pipe with sheet plastic or similar ?
Thanks !