If I'm making a very precise quilt I fuse feather light interfacing to the borders before sewing to the quilt. Especially narrow ones. A top prize winning quilter at Paducah told me she used misty fuse interfacing on her quilt top and backing before quilting to keep it smooth and square. She said that was normal for show quilts. I don't use it on the quilt tops or backing but it works wonders for my borders.