To anyone who's arrived here via Google at some point in the future, here's an excellent post on the subject by Paul G. Jacobson:

http://www.kayakforum.com/cgi-bin/Building/index.cgi/noframes/read/161924

: As some of you are probably too familiar with by now, the manual for my
: hybrid night heron did not arrive, and CLC sent another one out. It has
: arrived and it's for the shearwater series not the night heron. CLC will
: print the right one and send it out on Monday. In the meantime though,
: I'll be down near a large marine supply store later today and would save a
: lot of gas, money, and time if I could pick up the fiberglass and epoxy
: while I'm down there. The man I spoke with at CLC recommended 18 yards of
: 4oz 50" cloth, and 1.5 gallons of resin and 3/4 gallon of hardener. I
: retrospectively realize that 18 yards wouldn't be enough to cut 4 18'
: lengths linearly. Is 18 yards enough cutting diagonally sufficient to
: glass both sides of the boat with a double layer on the bottom of the
: hull?

: I'm going to go digging through the archives to see what there is to be said
: about what type of fiberglass and how much of it is necessary. A single
: layer of 6 oz? A layer of 4 oz. with a smaller layer of 4oz on just the
: bottom of the hull? Just thought I'd get the plea out there in case I
: can't find an answer to my question.

: Also, if anyone happens to know, how does Nick recommend holding the
: temporary full forms in place when stitching the hull? The manual for the
: Shearwaters recommends wiring in the bulkheads....