I used argentine lignum vitae for tip overlayes because I had some left over from making some scales for a couple of knive builds. It's hard stuff but basically self polishing as nocks. The only issue I'm having is the massey finish I put on the bow keeps coming off the overlays. I need help on sealing it. With knives I've use a mixture of fat and wax, but I hesitate to add what is essentially a lubricant to my tips and I'm pretty new to this.