I used to use a paper stabilizer (like the exam table covers at the dr.'s office) when doing satin stitch, but hated tearing it off. And I would think that freezer paper would be a nightmare to remove, since it's even thicker. I found that used fabric softener sheets are perfect. I save them up in a box by my dryer, then when I need them, I wash them (warm water and Dawn dish soap in the kitchen sink), spin them in the washer, and press them. They are so light that you don't really have to remove them, but I do anyway. Also, remember to loosen the thread tension before satin stitching.