Hmm, she didn't say it washed away, but if it does I would think it not as secure as the sheeted fusibles...being that most only blanket stitch or zigzag with tiny stitches to secure that appliqué to background. But thinking, now, hand appliqué is only held on with tiny stitches too, difference being turn under, no raveling edges......the demonstrator, don't know her name, has shoulder length silver white hair, has a website, have seen other you tubes from her, sewverysimple...or something like that????????? I'll stick to wonder under or steam a seam......