Hello Peter - excellent videos.
Some time ago I bought a knife sharpening tool and the manufacturers recommendation for the "lubricant" was that it was not there to lubricate but to wash away the debris and it was important, especially on oilstones, to use something that would not dry out and clog the abrasive.
Their recommendation was a mixture of kerosene and neatsfoot oil in a ratio of 1 to 2. I have been using this mixture in my sharpening and it works extremely well. It will even restore old clogged up stones to like new.
Some time ago I bought a knife sharpening tool and the manufacturers recommendation for the "lubricant" was that it was not there to lubricate but to wash away the debris and it was important, especially on oilstones, to use something that would not dry out and clog the abrasive.
Their recommendation was a mixture of kerosene and neatsfoot oil in a ratio of 1 to 2. I have been using this mixture in my sharpening and it works extremely well. It will even restore old clogged up stones to like new.