It's definitely not a pro job, but I don't think you'll have to worry about it rusting anytime soon.

[He did his best, buddy! At the very least, that should keep the sword in pretty okay condition for a while. Toshi returns it carefully to its sheath and offers it back up with a laugh.]

You look like you're about to fall asleep. Guess I did okay.

[More importantly, he didn't crack anything because if Kashuu can feel it he figures that would be Very Bad.]