I use batiks alot. I have never prewashed them, but I do use a color catcher when I wash them the first time. Like others said, use a sharp microtex needle 70/10 - larger needles leave big holes. Also, try to use a different fabric for the back - it can be difficult to quilt with batik on top and bottom. Other than that, nothing different than normal 100% cotton fabric. I have made dozens of bags from batiks and numerous quilts. Love batiks!