An old cutter years ago told me to use lava soap and I did and have for many years on both cutting and polishing laps for contamination. Polishing will move meets if done too much. Practice and more stones and polish and meets will get better. I would advise anyone starting to facet not too fret too much about meets but focus on getting the polish right. Good meets with good polish will come after some more stones. In other words take it in stages. Learn machine and cutting, then focus on polishing without worrying too much on perfect meets until you master getting a good polish. It will come together later.