Whatever the polishing method happens to be, make sure it's done in the same direction the rocker tip sweeps across the valve stem. Even microscopic grooves at right angles to the tip movement will exacerbate the rate of wear.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!