I don't spray baste until I'm ready for the quilt to be quilted, it holds fine until I'm done, anywhere from one week to a couple of months, then it's washed out. I don't want to store the spray basted quilt for a long time. Helmar is a temporary adhesive not permanent. It's the only spray adhesive the heirloom needlework shop in town uses so I figure it's good enough.