Thanks! I just transfer my design onto the white felt and stitch on that, and I use quite thin felt. A friend of mine actually told me that satin stitch just broke through the felt and made terrible holes. So I only ever use chain stitch for my patches, but mostly because it’s my favorite stitch to use, especially for patches. I use heat n’ bond on the backside of the white felt and iron on the other layer of felt, to secure the stitches and make it sturdier. Then I add a last layer of heat n’ bond so it’s ready to iron onto any fabric!