I was hoping to use it on a flannel baby quilt with a "Minky" backing. Vendor said to be sure to baste like mad before quilting as it can squiggle around, which is why the adhesive spray would seem useful. I've prewashed the flannels and the Minky backing already but will wash it again after it's completed, just to be safe.
Thanks for the assurance that the adhesive will wash out.