Mix your Bondo as instructed on the container. It cures fairly quickly, so work fast when after you stir in the hardener. I use a disposable plastic knife for mixing and spreading Bondo. Spread the Bondo over the stuffing around the "ankle", covering it enough to give it a lumpy, fleshy appearance. Allow it to drip or ooze anywhere, as this will only add to the final gory appearance! I also scooped up the remainder of the Bondo and placed it on the very top of the bone, letting it drip down freely until it cured and hardened.