Hi! Invisible thread is the most abrasive thread you can use. I don't recommend it because is can eventually wear out the tension discs on your machine. If your machine has a "mock" hand quilting stitch it can be used in the top thread. You should put your tension as high as it will go. By doing this the bobbin thread will be pulled up to the top and look like a hand quilting stitch. I have a Pfaff machine and many of the Pfaff's have this "mock" hand quilting stitch.