I have used Steam n' Seam on a number of appliqued quilts & use only YLI invisible thread. I don't use the blanket stitch, but my Viking Rose machine has a stitch that looks exactly like an applique stitch. It takes a couple stiches forward, nip to the right, couple forward, nip to the left, & so on. When I 1st got into quilting my sister sent me several brands of invisible thread. YLI is the one I had no problem with.