Use Superiors MonoPoly thread for invisible machine applique. Sue uses this thread when adding applique to a prequilted quilt. The MonoPoly thread does not melt when you iron it. Using it in the bobbin makes it possible to applique after the quilt is already quilted, making it easy to applique without difficult custom machine quilting.
Use the MonoPoly thread in the top when doing turned edge machine applique for a barely visible stitch that resembles Hand Applique.