Actually,I think the UHMW is ultra high molecular weight polyethylene. Nylon is a trade name similar to kleenex. Recycled UHMW is available at a discounted rate and various sizes behind the humane society in Tacoma at a firm named UltraPoly and/or PSI. This place already markets bumper strips to the marine industry. It is available from very thin (.250 maybe less) to 6.000 inches thick in sheet form up to 48 by 144 I think. They also have a rem pile that you can purchase from if you wish (various blocks and sheets). The stuff has a fairly low coefficient of friction and is very durable. It holds threads and thread inserts quite well. It does not, however, like heat. I am going to try painting the bottom of my sled with a new product which is a spray on Teflon (PTFE) similar to the cooking coating. I will let you all know how much speed and/or fuel economy I gain. The drifters could benefit by easier upstream rowing.