Slow Stitching - mending a sweater

I did some slow stitching this week to mend a sweater.  The patches on this sweater have raw edges and simple line of stitching to keep them in place.  With some wear and washing the raw edges are pulling away from the stitching so I used some dark mending wool to stitch two rows all the way around the edges of the patches in hopes that will keep them from raveling.  Slow stitching is relaxing regardles of the project.  Therese