I'm working on a project with medium-weight polyester poplin. I used some Wonder Under at one end to create a channel, like for a curtain rod, because the front can't show any stitches. The problem is that the poly poplin shrank slightly from the heat of the iron. I need to do this several more times. Does anyone use a fabric glue that's good on poly? Or have a suggestion for using the fusible? This bond needs to be secure.