No sprays... I just lay the top face down, center the batting over it, then the quilt back, smoothing everything without stretching. Then I fold the quilt in half and flip it, opening and smoothing, right side up. Then I use my huge safety pins and pin about every 12". I use cotton batting which 'sticks' to the fabric just by it's nature, so my layers don't shift around much. Never quilted a wrinkle on the back-- knock on wood!