I am a convert - turned to waxing all my/my wife's road/gravel chains - love it! However, speaking of MTB - I mostly ride my MTB in NorCal dry/dusty conditions, so thought waxing should work well for my mtb - I learned otherwise. Only after a couple of rides in completely dry conditions my chain started making this horrible grinding noise and shifting seriously deteriorated. It is 12 speed Shimano BTW. Go figure...