Hi Quilt Fish - the only method I've heard of similar to what you describe is using used dryer sheets (quite similar to lightweight pellon but much cheaper, LOL). This method is good for sewing small pieces that are hard to work with in needle turning. I have not done this method and prefer using freezer paper or hand basting 1/8" from edge of piece with quilting thread to give myself a nice defined edge to turn. Here is a link you can check out:
http://www.quilt-lovers-guide.com/dr...-applique.html
just copy and paste it into your web browser. Hope this helps!!