Barge cement is like a contact cement. I would think most leather from coats would be rather thin, so like said above,maybe double up around the seam edge. I go to a local Tandy( leather supply store) and rummage through their scrap bin and buy bundles of scraps for very cheap. Then I use the barge cement on the handle wrap, holding back from the seam edges, put a thin coat on 2 sides and belly side of bow handle, glue leather on then stitch. That way you don’t have to pull stitching quite so tight.