The 505 Basting Spray is the best stuff as others have already posted, you want to spray your batting not the fabric. Make sure you have a window open when using this stuff-it can make you a little light headed. Also, use masking tape to secure your backing in a taunt position on the wall or floor so that you don't have to fuss with it. One can usually is good for a full size quilt with some left over. I would try how things work for you because humidity will effect usage as well.