I have seen a few rave reviews for “Hurco” oil as THE best as a carrier for polishing with diamond.
The “Hurco” oil mentioned is said to be used to lubricate “brass” musical instruments with piston valves – like trumpets and tubas.
I thought this would be easy to find, but despite a lot of looking, I cannot find enough information to be sure I have the right item; most of the references to Hurco oil I see have to do with machine tools.
Does anyone know EXACTLY what this is and where to but it?
Look for “trombone oil”. I remember someone recommending this a few years ago. You’ll find several varieties on Amazon, including Herco. (Note the spelling). It will probably work as well as any other light oil, but don’t expect magic.