When I found a "boo-boo" on the back of one of my quilts for a baby, I cut out a heart shape from coordinating fabric, stitched it face down to a used dryer sheet. Then, I cut a small slit through the dryer sheet ONLY, and turned the heart right side out. Pressed well and stitched it with invisible stitches over the boo-boo. It looked great! I think that if you use any interfacing with glue on it, you won't be able to turn the applique.