Another light bulb moment!
I just finished a queen size quilt that the fabric (Maywood Studios) raveled profusely. I always use plenty of starch and keep the handling of blocks as least as possible. Whenever I have a seam that looks iffy I will double stitch. As I was adding sashing and sewing the rows together the loose threads were flying; the light bulb went off - I cut thin strips (less than a 1/4 inch) of lightweight fusible interfacing and ironed it to the exposed seam allowance, catching in the actual seam. Since it's lightweight and fusible it did not show through and made absolutely no difference in bulk when I quilted it. I didn't have to do it on every seam, just the ones that were questionable. May seem like extra work but really wasn't since I press every seam when I'm sewing and constructing.