Don't use White Out on the front sight. Go to Hobby Lobby or something similar and buy a bottle of Testor's Gloss White paint. Get a couple toothpicks (non flavored) and some acetone and you're all set. Put a couple drops of acetone in the paint dimple to degrease it, wipe it out. Do it again and let it dry. Put the slide in a vise so the rear face of the front sight is horizontal and use a tooth pick to fill the dimple with gloss white. Let dry.