nope you only do that in coating . if you were powder coating . and you heated the part then shot the powder on and cured it the powder will get in to the nocks and crannys so it will seal it . not with polishing the bubbles in the metal are there . when you buff you take metal away to form a smooth look . metal has texture and when you start to remove the texture you get a better reflection from the item . kind of like removing a mountain to let the sun flow in the window briter ..