The Rab SilTarp 2 is an 8 feet by 10 feet silicone nylon tarp targeted at the fast and light crowd. Rab uses a 30-denier, 1.1 oz. parachute, rip-stop nylon impregnated with 1/4 oz. of silicone. This level of impregnation gives the nylon the ability to withstand 1 lb. per square inch or the equivalent of 2 feet depth of water pressure. They claim that’s enough to withstand leaks from even strongest rainstorms.  The tarp has 16 nylon webbing loops sewn to the corners and at 2-foot intervals along the edges. A ridge-line seam, that needs seam sealing, runs 10 feet down the center of the tarp. An additional tie…