Sue Nickels showed us a quilt that she used a light fusible on the edges (cut away the fusible on the inside before ironing down on the fabric) and then did a blanket stitch all around the edges. The quilt was washed numerous times and there was no noticeable fraying. She uses Soft Fuse and it is wonderful.
Remember that she and her sister have won more than 4 national awards using this technique.