I'll have to try the Kiwi polish. Have had pretty good luck myself with Hornady One Shot. Just be real liberal with your application of it to be sure all your metal gets coated well.
Can't see why JB Weld wouldn't work famously, unless of course you would need something a little more viscous. I'm sure powdered metal or microballoons would help with that.
I used Loctite epoxy to "bed" an aluminum arrowshaft in a Remington tupperware stock to stiffen the foreend as an experiment once. Wasn't sure how it would turn out, but it worked great. I didn't add anything to increase the viscosity, as I liked the more liquid consistency of it for that situation.
