Originally Posted by thepolyparrot
A whip stitch is an overcast stitch - in on one side of the seam, out on the other, pull through.
I don't sew or use the joining tape when I spray baste or when I'm using fusible batt. If you get the pieces butted well without any overlaps, then spray, the fabric you put over it will hold the joins together.
If you sew two butted pieces together with big stitches,
it you will not have trouble in the future, with the batting curling up or shifting, especially in the washer or dryer!