If you have access to the 'steel' epoxy, use it. Many regular epoxies will soften with long exposure to water but JB Weld and, hopefully, that stuff you have access to don't seem inclined to do that. If you're sure your epoxy won't soften then use it if you prefer.
One reason for using JB Weld is that it sort of matches the color of steel while most epoxies are clear. This becomes more important if your guard isn't quite perfectly fitted ..........
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