Lee, do you have a picture anywhere of the kind of work they are doing? If so, it might be helpful in figuring out what sort of adhesive might be appropriate.

If they're using white glue you might want to take a look at E6000.

If they're using hot glue you might want to take a look at HiPurformer MP300 (note that MP300 is the only glue in the HiPurformer line that is supposed to work on copper).

Either should, from your description, make a bond that is more than adequate for the application, and both are very easy to use (do read _all_ the instructions though).

Don't see any reason to use an epoxy in the application you describe unless there's more to it than you mentioned.