Seam Align glue is designed to gently hold two pieces of fabric together to prevent shifting. It will not leave a ring around the needle or mess up your sewing area. There is no hard dot of glue for the needle to hit and deflect. It is totally water soluble and non-toxic.
Gently squeeze applicator bottle to apply a tiny drop of glue to the fabric. Drops should be about 3/4 of an inch apart. Position the second fabric exactly as desired. Once the two pieces are aligned where you want them, set the iron on top for a few seconds to set the glue. Made a mistake? Not to worry, Seam Align will pull apart easily without damaging the fabric and leaving a bunch of residue. Just re-glue and carry on. Sew with confidence. The top layer won't grow and nothing will shift. No stopping to pull out pins!