I use stay flo - mix half and half or 1/4 to 3/4 starch. I have found the best way to use it! Spray the fabric until soaked, throw it in the dryer until dry (no flaking in dryer) then steam iron or use a little water spritz. Walla! Cardboard fabric! Ha.
My cuts are much better and my piecing is much more accurate as my fabric "sticks" together.
I also stack them like cards and shuffle. Not really LOL