I always label mine after the binding is on. I use a nonwoven fusible, sew it with the bumps and the right side of the label together, trim it to a scant 1/8th inch seam allowance, cut an X in the fusible and turn it right side out. Then I write on the label with either a fabric marker or a Sharpie (I prefer the fine point not the Ultra fine point) then using my applique pressing sheet I press the label so that the fusible doesn't show around the edges and then I iron it onto my quilt back and do hand stitching around the label just to be on the safe side.