Was in wally world yesterday and, as always, checked the $1/yd bin to see what they had. No sil, but they did have a screen mesh that looked tempting (haven't seen that very often), but it was a poly/rayon blend.
My understanding is that rayon is/can be fairly absorbent, so my concern is that the material may hold condensation more readily than a standard poly or nylon mesh. Anyone have any experience with rayon or any thoughts? If it works, they had 2 bolts, both ~60" wide that would be a nice addition to the project materials inventory.