hi i used to work for crystalite/pacific test specialties in the 70’s when we pioneered the making of the plated metal bonded diamond wheel. i used to make the flat faceting and cabbing flat wheels at the factory and later demo’ing the products with the boss at the show all over u.s.a. .. we put out the crystallub he was talking about that was used on the pads to lub and remove cuttings. it was a 30 weight silicone oil then but later mineral oil was added to it. mineral oil will do the job too. i’m using a gallon jug of mineral oil i got from a farm supply labeled as a laxative for farm animals and it works extremely well for the pads,laps and my trim saws. however my preference for facet polishing is a pure tin layered lap (not scored in any way) with 50,000 diamond powder. run lap very slow so’s to not sling everything off, with very slow water drip to make a thin wet mud of the diamond powder. i find this polishes just about everything. i have an 8″ and 6″ i’ve been using for 40 yrs and still work fine. one might try and use the same procedure on a phenolic lap too. i’m not a happy user of oils in faceting, it makes it difficult to see if you have a polish as oil fills scratches. clean stones before un-dopping to check. i find useing the diamond powder much better than the compound which is greasy . i get my diamond powder off of Ebay for about $15 for 5 grams=25ct and does a lot of stones. i’ve found very slow speed and the diamond mud work fine.