I glue baste with liquid Elmer's' School glue. A tiny drop. I set the glue with an iron. .Any basting glue will work. After sewing the seam is easy to press open, a dab of water will loosen the glue if needed. I glue baste all my quilts for machine quilting and never have a problem with needles. I use a glue roller so the glue is put on very smoothly and thin. My quilt sandwich is like sewing on paper. Nothing shifts.