When I'm ready to use a piece of fabric, I starch it and then iron it, before I cut it up. I use Best Press mostly. Usually when my block is finished I will starch it again. Some might think I overstarch, but it doesn't feel like it. But IMO I always starch the first time I iron a piece of fabric. It makes it keep its shape so much better than non-starching. I also extra re-starch if I'm using bias cuts, i.e. triangles...