I built a SOF kayak a while back that I skinned with a PVC skin. Turns out that the way the skin fit the frame didn't allow me to get a good seal on all the seams and it took on a lot of water. I was bilging every 15 minutes. So, I've decided to reskin it with a nylon/polyester (not sure which) skin. The skin is already treated and is incredibly light, I would say 6 or 7 ounces at most.
My question for you fine folks is what type of thread/line do you usually use for tying and tightening nylon skins and what is your preferred treatment after the skin is on? Is one sealant better than another for particular fabrics?