What worked best with mine was to lightly sand in a coat using 1000grit wet/dry sandpaper. I used tung oil finish on mine. Let it "mud up" a bit and then dry for at least a week. When sanding in the next coat go very lightly just enough to clear up the mud and wipe it dry. The sanding mud fills what little pores there are on the French Walnutand leaves them very smooth. Remember to sand to the edge of the checkering but not over it!
I used a little steaming and this method to remove scratches from both my FW Kimbers.

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On a finish that's not as smooth you might want to sand the first coat with 600 then move to 1000........................DJ


Remember this is all supposed to be for fun.......................