I have precut topper pieces for my small hoop. When I need something for the larger hoops (5x7 and larger) I have found Glad Press and Seal is amazing. It is nice in that it presses onto the fabric before you hoop and doesn't shift around and yet it tears away quite easily when the embroidery is done.
I will post a picture latter on this week to show how well it works. I will be appliqueing a piece on my large hoop.