Had the same Problem with the LArm which Grace is the same way ,I learned to use the Temporary Quilt Spray and Iron the Layers , Pins just left a Pucker,Put it on the ironing Board Backing 1st spray thenput on batting spray thenadd the top Iron the top then turn and iron the back too, If it's real soft fabrics I put spray starch on top and Back before Ironing it. It works like a dream for me and no Lumps or Puckers, Hope it helped!!! No the spray doesn't gunk up the needles.