John: Depending how big the runs are, if they are small start out with 1000 to 1200 grit wet, if you have a straight block I even use a wooden mixing stick "cut it down" 4" carefully like you are planning a piece of wood. Another option take a new razor blade between your fingers slight angle like you are standing the blade up on the edge light pressure drag the edge over the run like this the back slash as your blade ( \ ) moving to the left. If the runs are large carefully start with 600 to 800 wet than finish off with 1500 to polish. Hope this helps