Where would I use Heat-Away?

Use it as a "topper" in machine embroidery or buttonholes when a water soluble stabilizer cannot be used -- such as on velvet and velveteen, and any dry cleanable fabric that has a nap. Some wearable art designers use it for battenburg lace and as a foundation for special free-motion work like machine spun lace (needlelace), bobbin lace, and faux weaving by machine. It's great to use as "the fabric" when making computerized embroidery motifs into "fabric-free" pins, magnets, etc.