This is the best stuff we've found for sticking on tips. A strong super glue, it's a gel so doesn't soak in to the tip or the end of the cue, preserving the feel of the tip and the life of your cue.
Its non-drip formula makes for less mess than regular super glue.
For the chemically-minded Bison's super glue gel is a thixotropic cyanoacrylate adhesive!