Lexol is what I use on leather. Back in the day of leather duty gear I always used black shoe polish (paste kind - not liguid) on my Sam Brown belt holster,drop pouch,handcuff case,etc. Keep it supple and nice looking. Properly buffed it never came off on uniform. Inspection on Saturdays of daylight shift (once a month) you better be looking sharp. (That was 40 years ago!)