Originally Posted by
maviskw 
So far, no one has mentioned
school glue. If the layers are going to shift, they will do that while you are gluing it. Once the glue is dry, there is no more shifting. I've done king size quilts, and once in a while I have to add a little piece of batting to a side, but once it's glued on there, it's solid.
I've used Elmer's school glue on small projects...table runners and wall hangings, but haven't tried it on a quilt yet. So no need for extra backing when using school glue on a quilt?
I have found this to be true. Very little shifting. Does that mean I cut exactly to measure, NO, why would you take the chance? But I do not leave 3 inches per
side.