I use 505 on all the ones I quilt. I can't stand long enough to pin them and hate hand work, so no basting for me. I have sprayed several quilts at a retreat and brought them home, left them in the car for several days, they sat around for 4 months while I procrastinated. When I was ready to quilt them, the very edges needed to be held down, otherwise all was well. Perhaps you sprayed the back, applied the batting and then sprayed the batting to apply the top? I usually spread out the top (right side up), spray and apply the batting/backing to the top. I never spray the batting, as it gets absorbed quickly and wastes too much. Just mho.