Elmers glue is a water based pva glue, so it will also wash out after repeated washing. Either fusible interfacing or glue is to hold in place for stitching (and for awhile after). If doing large pieces, I like to do the small bit around the edging and turn it to save on the fusible. Then I stitch it down. Quilting will hold the rest. Note - if using the elmers, be sure to NOT use the blue glue - it does stain.