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steel wire no prob,just don't tie too tight as it will cut the wood a little. When the temp gets down to freezing the epoxy just won't cure for a week or two,if the day time temps get up to the 50's there's some hope for continueing the work. As far as dampness is concerned you might get more amine blush with a faster hardener but check with system 3 data. The epoxy usually has some formula for figuring times for cure at different temps, something like for every x degree less than 77(?) there's a doubling of the time it takes to cure or something to that effect. why not experiment with a few tablespoons of the stuff? mix a little epoxy and make three test panels that are two pieces of plywood lapped onto each other. see how long it takes for each panel to go to full cure,in other words if you bend it,the wood breaks not the joint. in the shop make one piece at night,one piece in the morning, and one piece to cure at some steady temp. between shop temp and house temp. That way you'll find out how the glue cures overnight in the cold, during the day,and at some likely temp that you can maintain with a heater or lights.
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Guillemot Kayak - High Performance Wooden Sea Kayak Designs