Can somebody explain the advantages and disadvantages between Diminishing & Non-Diminishing Polishes? My understanding is that Menzerna are diminishing polishes, am i correct? 1Z are non-diminishing? Also what is the advantage to finishing with a Porter Cable, if any, and what polish would i use to finish with a porter cable. From what i understand for a porter cable to polish effectively i would have to use a polish with non-diminishing abrasives?