I have used regular Elmer's School Glue for sandwiching on several small/medium projects now--I don't spray, I just apply an even, light stream of glue in a grid pattern. While it's still wet, I iron to make sure that it's perfectly smooth on both sides. Yes, you can see some spots of glue during quilting--no big deal; they wash out completely when the quilt is laundered. There has been no problem with it getting on the ironing board or iron. I'm going to use it on a bigger quilt, doing it in sections. I think it will work out really well, much better than anything else I've tried.