I used terry cloth and made like a pillow slip for each smiley face. We used them each time we roll them up to keep from scratching. On our last boat the isenglass scratched just from normal use. When you think about it, rolling up a smiley puts the zipper inside the roll. So a little wind, or bouncing around can scratch them.
Since we live aboard and live in Florida we don't take the whole panels off EXCEPT for Hurricane threats. We just went through prepping for Isaac (we were fortunate that he missed us), we took the isenglass down and put beach towels between them.
Cape Coral, Fl