The spray adhesive allows you to pick up your material and readjust without applying more spray. Always spray the batting not the fabric. That is what my lqs told me to do. This is how I do it; Lay down my batting on my table, adjust my backing to fit the batting. I fold backing material half way back to spray the batting, smooth out backing and do the other half. If I need to adjust I pick up fabric and smooth with my hand. Then I turn it over, with batting on top I lay down my quilt top and do the same. Then I pin randomly. It always works for me.