I have done both spray baste and safety pinning. I find spray basting works like a miracle... no matter how much I twist and bunch and flop the quilts around. I also find the smell of some overwhelming...and while I do like 505 I find it sort of expensive. The quilt I am working on now I am pinning with brass safety pins.. but not really sure how far apart to place the pins. I am really curious about the Elmer's school glue technique. Can someone explain that technique to me? Or point me to a thread that does explain it? Thanks