If only I knew about this sooner!
What a revelation this has been, brilliant for keeping non stainless knives from rusting but also helps to reduce friction on SS ones! Easy to use, apply, wipe around, leave to dry and react with the carbon. Leaves a slick surface that also protects the blade from rust (something about bonding with the carbon)). This little bottle should last me a while too. So many of my bushcraft knives could have been saved by this, definitely a bit of essential kit imho.