"Russell Duffy" <13brv3@bellsouth.net> wrote:


"""
  I just looked up the description of "bid" on the
Spruce page, and can't say
  that I can see any difference between that, and
normal cloth (e-glass?).  I
  cut the cloth on a 45, and usually have pretty
good luck going around
  corners, but I'm sure "bid" is probably better,
and certainly my technique
  could stand some improvement.  I'm using the
lightest cloth I could find, at
  6 oz, but wish it was a little lighter for the
initial layers.
"""

The term "BID" simply stands for bi-directional, and
defines the cloth as being woven with warp & weave at 90 degrees to each
other.  This is in contrast to "uni" (unidirectional) type cloth in
which just about all of the threads run in one direction, with single threads at
90 degrees every several inches just to keep the primary ones intact.  As for
weights, you can find much lighter fiberglass cloth at the local hobby
shop, with material down into the 1/2oz range.  For what you're doing, you would
probably be well served with some 2oz next to the mold, overlaid with
several plies of 6 oz to add strength to the exterior and the overall structure. FWIW....

      <marv>