I have found that dry cracked, not by anything but just natural drying, antler doesn't work well, chips easily and in some cases almost goes to dust. Look up finishing Pens with super glue and it may give you some ways to stabilize it but you will probably not be happy with the results. Usually starting with thin and while it is still wet putting on some Medium and may be some Thick, the thin will wick in the thicker. Let it dry and work it. If you try this route shape and finish it before you put the glue on it because it doesn't take a finish. Feel the same about it as I do delaminating horn, ain't worth the time, l quit trying years ago.
Tim C.