I'm with Kevin-I've found nothing as effective as Gorilla Glue. I'm not a pro so take my opinions as such, but I do 3-4 tips a month for my own cues and those of my buddies. Downsides to Gorilla Glue are the long cure times, the need to clamp, and the necessity to mask off the ferrule since it expands as it cures. On the good side, it doesn't care what the material is (phenolics, composites etc.) it just flat works and doesn't come loose. Also, since it doesn't dry as hard as super glue, it's easier to cut off an old tip, which is a big advantage for someone who is constantly experimenting with tips. Even in my limited experience, I've seen some ferrule mating surfaces butchered up from previous tip jobs. The expansion of the glue will help fill the smaller gouges, so you don't need to surface the ferrule absolutely perfect. One final note if you're new to tip repair-Don't go near one of those old-style mechanical tip clamps. Stretch a wide rubber band over the tip and run a couple turns of tape around the shaft to keep it taut. Do it right and you'll only need to do it once.
Bill