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Hi ben, Your best methods for keeping costs down will be finding a low cost supplier, Epoxy,wood,glass, building supplies,varnish,paint, roughly in descending order of costs (everbody's different,but that's off the top of my head). I do not know if it is possible to cut glass as you've described (certainly not with a saw), but I imagine the unwrapping being a potential mess. It is a loose weave fabric that probably would distort all to heck from the rolling and cutting.
Look around for a low cost supplier, Defender industries has good prices on glass. What do you need 3" tape for? 1 1/2" is sufficient for deck/hull seams. If you are going for strength as your last post implies, you can get 6oz cloth and make a very,very strong boat by putting double layers only where needed. 10oz cloth commits you to using a lot of glass/epoxy in areas that probably don't need it.
Another way to cut possible unnecessary cost is to practice(assuming you hava not glassed with epoxy) glassing on a couple square feet panel to see how much epoxy is needed to glass and fill the weave. learning on 10 oz glass on a new construction could use a lot more resin than necessary. Actually, how you use the stuff and where you buy it factor equally in controlling cost.
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Guillemot Kayak - High
Performance Wooden Sea Kayak Designs
