I recently had an 'ah ha' moment. I was using my design wall as the backing to adhesive spray my quilt sandwich. It dawned on me that I could use the adhesive spray to MAKE my design wall sticky, too. I did, and anything I put on it sticks, and I can re-place blocks and pieces to my hear'ts content. Spray adhesive lasts a LONG time. And if/when it doesn't work, I can re-spray.