I've used gel and thin super glue, TBII and TBIII and 2ton epoxy, all with good results. If you use super glue saturate the pithy area first with super glue then sand it flat and glue it down. For all of these glues, be sure the glue surfaces are well matched.
I like to use rubber bands as clamps to wrap the overlays on the tips.
Also pre-shape the overlays, especially where they come back to the limbs. Otherwise, once glued on it's hard to get a good transition without going into the tips.