I have NEVER prewashed any fabric and have made so many quilts. I always wash them after I make them and have never had any bleeding. They always crinkle, which I want to happen. I iron the fabric before I sew it. I don't want to wash it before I sew it and have to iron it really well. I don't want it preshrunk. I like the crinkly quilt. Lots of quilters don't prewash.