I just do REM "Because"
Because the gears mesh better and seem smoother when they rotate.
I've done all the gears in my Proflite and it has noticeably improved rotation when building it. I've done a few other sets for some Comp racers. I'm sold on REM finishes for durability.
Here is an ad that gives HP numbers if that is what your looking for.
https://innovatorswest.com/REM-gear-polishing.html
I have wondered about using this process:
http://www.microblueracing.com/smoot...solutions.html
I would like to hear from someone that has used it on rear gears.
Hope this helps you Dan