I have recently used Elmer's School Glue with Hobbs Polydown batting on a baby quilt. I first put the quilt top on a table, wrong side up, made a grid with glue, and then place the batting on it. I then removed the top and batting from my table, and placed the backing on my table wrong side up. Then I place the top and batting on the backing and smoothed them until the top was perfectly smooth. Then I turned them over, and used the iron at a medium setting to fully smooth the back of the quilt. Once it was pressed dry, it held the sandwich together perfectly. I quilted it with no problem. I did the same thing on a lap quilt, but I did it in sections. No problem. I think that maybe it worked with the poly batting because the wet glue went through connecting the top and the back when it was pressed.