I've used gel super glue, 2ton epoxy and TBII, TBIII, all with good success. I have had a few overlays pop off but from each type of glue so I'm sure it was my fault. If your antler is pithy on the glue surface saturate with thin super glue, let it cure, sand that surface flat and glue it down to the tip. The pithy antler seems to soak up the super glue and starve the glue joint if it is not sealed first.