Jan, with the spray I would want t template to protect the rest of the fabric, and with the rug backing I wonder if it could be thinned down and more than one coat applied? Decisions, decisions.
With the rug backing AC Moore's is just down the road, I may have to get some in the next week or so and play with it. The non-skid could be useful on the palm and fingers of gloves and mittens.
All I wanted was to be able to knit some kilt hose when I started but this addiction just get deeper and deeper.