Although I haven't started my red work quilt yet - it's still on my bucket list, when I embroider faces for dolls I always put a layer of very light sew in interfacing, as this tends to hide the stray threads, plus give it a little more stability. I don't think I could recommend fusible interfacing or HeatnBond for red work,it would make the piece harder to stitch. That's just my personal opinion.