Because of several seams coming apart at the edges of blocks, I have learned to sew my seams with a 2.0 stitch. If there are a lot of seams on the edge of the quilt, I will put a stay stitch about 1/8 to 3/16ths inch around the edge after all the blocks are sewn together. I will use a 2.5 at that time, because the thread will keep the edges from coming apart. I haven't had to fix a seam in the middle after I have started quilting, but I am sure one day I will. "smile" All these answers will help when I do.