i still say NO oils ,, no GREASEs have you ever tried to stop your car on an oily or greasy pavement. you want contact with polishing agent and stone and oils/greases are lubs not wetting agents and worse for diamond. the best way is very slow with water, a wetting agent, and just enough to make a muddy slur of the polishing agent. i teach(for free) to use a tin lap turning very slow with just enough water to make that muddy slur of 50,000 diamond powder and not enough to flush everything off. i have members that still wanted to use oils etc. and finally my way and swear by it now.