I have used school glue on poly and had no problems, but I am not sure about using the rolling pin. I would be worried that it would smoosh the glue through the cotton onto whatever it was laying on. I just swirl the glue on the backing in a sort of grid of about 4" to 6" apart, lay the batting over top, glue grid on the batting, lay top on, then hand smooth that section or whole quilt depending on size of course, and allow to dry. On larger quilts, I do them half at a time because once the glue dries I can move it around to do the other half. I do not have a quilt assistant to help with such things.