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Try using Devon or JB Weld as the epoxy part, they already contain metal and are for bonding metal together, should stick fine. Mate of mine used to use Devcon for filling holes in foundry casting...

BEautiful work. I've used epoxy to seal cracks in wood I was working, but never thought to infill like this, I'm inspired for some new projects I have planned to use this to create highlights. Thanks...