Ulta Sail claimes it would have more stretche resistance than Polytarp and is very light and durable. Unfortunately you have to send your sailplan to find the price for a custom made sail kit out. They don t sell only the sail cloth. 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.
Other not boatbuilding related links. You do pay for it with your name and the trust of your readers. Give them a chance, show them what can be done with their data - even on your site. On his site you will find a lot of informations on snooping possibilities built into your browser, OS, into programs, your processor your music player and into your email. The more help he gets the more he will find out and the more likely it will be that the FTC takes action.