She's talking about waste canvas. You baste on a patch the size you need, use the grid to stitch the design, & dampen thefiber. It either dissolves or softens so you can pull out the strands. Water could be a problem if your satin isn't washable. There are still iron on patterns around ; I saw some at JoAnns. Lastly, you will need some stabilizing interfacing on the back to stitch the design through for strength.