If you are appliqueing through a single layer, yes I would use a stabilizer, but if you were going through the batting and batting, probably no. However, I, personally might not use a satin stitch, I might use just a straight stitch about a scant 1/4" from the applique edge or maybe a blanket stitch. I'd have to try it. You also need to consider how big your quilt if and how easy it will move while appliqueing.