Do NOT drip the superglue into the hex. Put the glue on the wrench tip. If that does not work, and it usually does, you can drill a drill bit into the grub screw, and once it starts to get bored in, the screw will start to turn. You can then either screw the grub screw all the way through and out the other side, or reverse the drill and back the screw out.
Use a regulare allen wrench of the same size . The fin key type wrenches we get are made of a softer metal than a actual allen wrench . It designed that way so you strip the key and not the fin screw. Try using a allen wrench of the same size . Put a dap of PB blaster in the whole and then the allen wrench it should come right out