Thank's Carl, will try the next time around.
For bonding to alu, I got the advice to prepare the alu to be glued (sanding etc.), but the last thing to do, was to wet-sand the surfaces to be bonded with epoxy instead of water. I have not tried it yet, but it sounds like a very good idea. The guy who came up with this was trying to repair an alu track that had pulled off a carbon mast..