Electropolishing removes and diminishes scratches, burrs, and unwanted sharp edges from most metals. It does result in minimal dimensional change. 

Dry Film/ Solid Film Lubricant

Dry film/solid film lubricants are high performance coatings that bond to the surface of the part, improving corrosion resistance and reducing galling, seizing, and fretting. These lubricants improve the life of parts and allow for operating pressures above those of normal greases and oils. They also are less likely to collect soil particulates and grease than most other oils and greases, and are self-burnishing in some aplications, improveing performance over time.