For me, the best compromise between weight, coverage, durability, and cost was to use the DIY Gear Supply 30d Sil (found on this page). I wanted a specific color for my tarp that wasn't offered in the 2nds (also on the same page, and approximately 50% the cost), or I would have gone with those.
Wonderful material to work with, as long as you know how to sew. You may want to increase the presser foot pressure, though, if your machine has that capability; the sil can be difficult to feed through on lower pressure settings since it's very slippery. Pins are definitely your friend.
Bookmarks