It's glue that comes as a cylinder with one epoxy wrapped around the other. You cut off a slice and mix it in your hands.
Yeah you can use hot glue. I have used epoxy resin and epoxy putty. The putty was the easiest to use and didn't break with the force.
Epoxy itself is glue that will hold to metal.
There are no health risks of epoxy glue,unless you ingest it.
Yes you can use epoxy glue inside. You can use it anywhere.
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You can find epoxy glue at most hardware stores and at Walmart, Rona and Home Depot.
Any of the normal epoxy glues would be usable for this.
Epoxy if not much to glue. PL200 in caulk tubes if there is lots to glue.
Epoxy or E6000 would be nest. White glue won't stick to the jewellery.
There are hundreds of different types of glue. Super glue, crazy glue, white glue, yellow glue, fast epoxy, silicone, slow epoxy, ABS pipe glue , just to mention a few.