Thank you.
I'm giving it a try with a Grade 1 Smith, that does have an existing weep hole right next to the forend hook, muzzle side. Getting etching solution in there seems a bad idea, so I plugged it, but I imagine that there are still voids along the ribs that fluid could penetrate.
I'm using steam to convert rust instead of boiling, so there's no submersion there, but there is with the etchant dip. Maybe that's why some brush on the etchant; to keep that stuff out of the weep hole.
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