I starch heavily my fabrics before cutting and never have a problem with white flakes. I find if you spray on the back side, let it soak in or even dry before you iron it you shouldn't have flakes. This last time I had 3 yd piece to starch so I just put it into a wash tub and poured the starch over it to soak it, then wrung it out as best I could. I left it hanging over the wash tub to collect the drips. Not one flake while ironing it flat. I make my own starch using the Vodka recipe plus I add liquid starch to the batch as I like my fabric to be fairly stiff before I start to cut.