I don't know if this will be a problem with the Ka-Bars, because they are a different steel than the Camillus made Becker Neckers were, but the other day I took the paracord wrap off of my Camillus Becker Necker and discovered that it had rusted a good bit under the paracord.
I sanded and brushed off all the rust and black coating of the handle area, and I'm going to try to spray paint it black later with some good-quality spray paint.
But I doubt I'll be cord wrapping the handle of my new Ka-Bar Becker when I get it.
I did wear the knife alot under my t-shirt, so the cord wrap probably soaked up some sweat, but I was thinking the black coating over the metal would stand up to that.
Instead, it appears that the cordwrap, though it was very tightly wrapped, somehow rubbed against the finish, wearing down to the metal.
Then, when the rust started, it spread under the black finish.
Luckily, the damage was just cosmetic. Once I re-paint it, it will look fine.
But no more cord wrapping of carbon steel for me. Your experience may vary, though.