Preparation, I suspect, is the culprit 80% of the time for failure. 19% of the time is more than likely the glue being used. Not the type, but the age and exposure once the glue container has been cracked open. The other 1% is incompatibility. Some ferrule materials are just fickle to get glue adhesion too.
Scratch, cross hatch, drill holes, do whatever you feel works best for you but CA glues like smooth, flat surfaces for the best adhesion on a non-porous object. If you are gluing a porous object to a non-porous object and have a failure, the prep is likely the culprit but refer to the first paragraph of this post for further information.
disclaimer: I do not use CA glue for tips on my cues.
Scratch, cross hatch, drill holes, do whatever you feel works best for you but CA glues like smooth, flat surfaces for the best adhesion on a non-porous object. If you are gluing a porous object to a non-porous object and have a failure, the prep is likely the culprit but refer to the first paragraph of this post for further information.
disclaimer: I do not use CA glue for tips on my cues.