I never starch my backing and have even quit ironing it unless it has sharp creases in it. I clamp it to my glass topped dining table and lay batting on top, clamp it and put my top on and clamp it. I pin W/safety pins about every 3-4". I do this way until all is pinned and I don't have the problems you are having, I FMQ. This works for me. I don't use the spray, I have a bird and for his safety I don't use anything that I think might hurt or kill him.