I do not sew a double stitch line, nor do I backstitch. If the pieces are smaller or being cut down to smaller pieces, I will use a smaller than normal stitch. Otherwise, all of the stitch line ends will be stitched over and secured when I put the blocks together. Once finished blocks are together and top done, I stay-stitch around the outside edge so I don't pull any seams loose while quilting. My quilting is dense enough (but never dense enough to make the quilt stiff) to secure the seams as well. I have made quite a few utility quilts for the house and those get washed often. I have never had a seam pull loose.