The question I get asked most often is whether or not the edges on the appliques fray.
My offical answer: Just a little.
The Wonder Under stops most of the fraying. The straight stitch will stop the rest.
You can do a tight zig zag (satin stitch) and enclose the edges completely, if you prefer.
Here are 3 examples from Bennett’s closet. They’ve all been washed repeatedly.
Click on the picture to enlarge.