I would not use washable school glue for anything that isn't getting washed after completion. Glue can leave little blobs that turn into hard spots when dry. School glue is also a starch based product and might attract bugs. If you are doing the quilting yourself, I would use a spray adhesive. If you take to a LA, no basting is necessary. In the future.... for anything that will be washed....prewash your fabrics to eliminate any bleeders and get rid of the chemicals used in fabric production.