Most suited for wood-strip construction. They let you also buy only the tarp without need to buy their set but you can get all you need at their place too. They also sell a finished 60 sqft Sprit sail. Tyvek, an article by Bill Wallace Tyvek is a sort of building paper, manufactured through the US-manufacturer Du Pont. It is used in the USA as a house building paper tacked on the outside of plywood walls to protect them from getting wet.
Most houses built here in USA have plywood walls.
Raka Inc s Epoxy User Manual Online Manual for Raka s own epoxy products. For me this seems to be not only flotation, it also helps to keep the boat from capsizing and is some sort of fender too. John Boley s plastic boat fender on an OSS dinghy new John puts the fenders as outside flotation devices to the sides of his little OSS dinghy. This probably will help a lot to keep the boat stable even with high load. SilverWing new Jeff Doyle built the free D4 Dinghy and designed it s Junk Rig like wing sail for it.