When doing a bookmark, I have a stiff felt. Do I still need to put Stabilizer on the back???

I did one that had a satin stitch at the end. I did all the embroidery then before the satin I put a piece of cutaway on the back to hide my stitches. It worked out well.

You could use a tearaway - if you thought you really needed one - but I bet you don't.

No, I would not.
Bev