I've had a teflon pressing sheet for years. I like to build appliqué on it. Sometimes I just use a sheet of parchment paper , that works well too.
There is a difference between an ( interfacing) and paper back fusible used for appliqué. They are two very different products. I do a lot of appliqué and usually use heat n bond lite, sometimes steam a seam 2. Wonder under and misty fuse are also popular available brands.