I work pt at a fabric store & a customer told me about using Elmers School Glue (has to be the school glue) instead of pinning. When she initially tried it (she was skeptical of this), she immediately liked this method better than pinning. She said it made it so easy to be perfectly accurate.
She bought a special tip that goes on the glue bottle to ensure a thin line. Runs the line of glue inside of the 1/4" seam allowance towards the raw edge of fabric, then goes over it with her iron to hold it. She said the school has cornstarch in it and it completely water soluble so if you want to remove the glue, just wet it a little bit. She said there is absolutely no shifting of fabric and her seams match perfectly.
Has/does anyone done this? I am going to try it out next time I am working on a quilt.