That's not a knife, this is a knife.... but bigger
I've never used this product on a knife.
I use it to keep the rust off of my various swords, axes and armour which are used for historical medieval combat. It works great on the steel, but also I apply it to the leather and linen pieces as well.
It works really well and is a much longer lasting protection than using WD40 or Ballistol
Highly recommend it for this purpose.