Hi Marc, theres a glue that comes in a caulking gun tube called AV515. It sticks just about anything including metals. It is used a lot in joinery and is notoriously strong. I havent used it on metals but I can tell you this; I decided to test it once and glued a piece of hardwood to the concrete slab in the shed. After 24hrs I was hitting it with a sledgehammer to get it off. When it finally came off, it took an inch of concrete with it. THATS A SERIOUS GLUE.
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