Your question caught my attention because I have a tip overlay to repair, too, due to GT nocks breaking on my arrows. (Darn things)
I happen to have Smooth On and plan on using it to glue the new pieces on. About now, Mark, you are probably thinking, "What is Smooth On?" It's a two part epoxy bowyers use for laminated bows. Because I build the occassional bow I have some on hand. It would be pretty expensive, though, to buy it just to repair a tip overlay. If I were in your shoes I would purchase some very good two part epoxy at the hardware store for this purpose. Be sure to sand and clean both surfaces well before gluing. I use brake cleaner as it leaves no residue.
All the best in your fix,
Christopher