Game Mechanics: Sharpening Stones and Rusty Weapons (not working)

[Sirelk]

I attempted putting a sharpening stone into a forge with a rusty 2hander yesterday and it kept telling me "those items do not combine" (not the exact wording, but close).

I tried with 1 single sharpening stone and the sword, and then 2 non-stacked sharpening stones, 3, 4, etc... same results.

This was at the main forge in Grobb. I didn't test this at another forge.

PS Really enjoying my time so far. I dunno how long I'll last, but it's been a blast seeing the old sites. Thanks for all the hard work!