There is another option for circles. Face them, then use a ..../\..... stitch to applique to the background with the "...." part of the stitch *just* off the circle and the point of the "/\" *just* onto the circle.
How to face with fusible:
1. Place fabric circle face UP on a surface.
2. Place a light/featherweight one-sided fusible circle (same size as fabric) on the fabric circle with fusible side AGAINST fabric.
3. Sew all the way around the edge of the circle with about 1/8" seam...do NOT leave an opening.
4. Make a slit in the middle of the fusible about 1.5" long.
5. Use this slit to turn the unit right side out.
6. Using your fingers, SLIGHTLY roll the edge so that the fusible is hidden under the circle and finger press the edge.
7. It may be necessary to trim some of the fusible fabric at the slit to help the circle lie flat.
8. When you are sure of your placement on the quilt surface, press the circle into place so the fusible will adhere.
9. Now you can stitch around the edge with a buttonhole/straight/satin/or blind hem stitch (as mentioned above) and have good clean stitches.
Looks like a lot of steps but it's really quite easy after you've done a couple.
Jan in VA