THe issue with aluminum is that the bond is usually to the oxide layer
that forms rather than to the aluminum itself. Some folks have had good
luck with epoxy and some form of "brillo" type pad or sandpaper to break
this layer so that the epoxy can bond to the aluminum. With a cast part,
you might get enough"tooth" to make 5200 work.

If it breaks and he puts it back a few days later there won't be
an oxide layer yet.


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