Yes, you can't wash this quilt if you want the glaze to continue to be on the quilt. I worked in Home Dec dept at the House of Fabric (large chain store that was bought by a big chain fabric store) and that is what I was taught to tell the shoppers. I have always loved the look of cross hatching. It takes time but you can use painter's tape to mark your diagonal sewing lines. It is blue tape here in the states which is not as sticky as masking tape.