I know I'm going to sound like the quilt police, and everyone's going to hate me, but I find that it doesn't take that much time to rip out that little bit here and there, and redo it, and you'll be so much happier in the long run. Think about the time it takes to make a little sample, try out the markers, heat set them, wash and dry them.......you'd have all those less than perfect areas resewn before you did all that!!!! C9P