I've been curious a long time about basting spray. Does it stay in until you wash it? I've gonna have a queen size to hand quilt soon. I'm thinking about getting a thick quilting hoop with a stand or a PVC frame. Either way, I'd like to try that basting spray. I don't have a lot of time to sit and quilt each day. It may take me months to finish hand quilting it. Will basting spray stay in that long or should I continue to pin or thread baste?