In a class with David Taylor this summer, he applied diluted starch around the edge of the freezer paper with a paint brush and then ironed the seam allowance over the freezer paper using a small iron (Clover). Then he sewed with invisible thread (I forget what kind) and pulled out the paper. A friend and I waited until the seam allowance dried and then took out the paper before sewing. Each method worked well. I hate invisible thread - can't see it - so I have been using this method with cotton thread that matches the applique piece. Works for me.