Low stick (blue) masking tape. This is really handy for making stops to ensure that you insert ferrules to their exact depth.
I use Steve's method when gluing ferrules, only took me one time ending up with a short ferrule when I over inserted while twisting it to spread the glue and the glue did that "Instantaneous set thing" to figure that the little extra time that takes saves a few choice words in the long run.
I normally use a two part epoxy when building at home though. But I still use the tape as it keeps you from getting epoxy up on the area you don't want it. I've never had an expoxied ferrule come loose.
Another tip - don't put your end cap on first then glue the ferrule, todays solid ferrules act like a piston and compress the air in the tube, when you let go out comes the ferulle, not so much of a problem with Super Glue but I've had it happen with epoxy.