I have tried used quilting pins (safety type), basting with thread, ironing after doing this and I still am having a problem with when I go to quilt the whole piece, that I have puckers in the back on the fabric. No matter how flat I get the back, smooth out the batting, then iron and smooth out the top, I have a problem. I have spray but haven't used it yet, as you have to have ventalition and it's expensive. I am so frustrated that I spend more time taking out the mess I have made and this in turn makes me unhappy about the whole process. Can anyone give me a hint? thanks.