I did this a few years ago. I used the starch full strength folded under the top and bottom edges. Works better to have 2 people doing it. I left the salveges on and just squeezed a little of the starch out. I used a half sheet cake pan for the starch and layered the fabric back and forth in it. I just smoothed it out with my hand. It works great but is messy. I used a cotton/poly blend.