I use Sewer's Aid when I am sewing with metallic threads. I apply it sparingly to the thread on the spool. Sorry, though, I have not used it for sewing with fusibles. I do hand-applique more than machine applique with fusibles. Also, I have never sewn the fusible to the applique. To me, it sounds like doubling the work?? I bought my sewer's aid as a LQS I think. Or maybe online? did you try Hancock's of Paducah?