Step 5: Cover and sand the outside corner
Use a 4-inch finish knife to spread out joint compound about four inches from the corner edge or nose of the bead. Feather the compound onto the wall as you go. Once dry, sand the first layer with 120-grit sandpaper. Wipe away the dust and apply a second coat, using an 8-inch compound knife and feathering the compound out two to three inches beyond the edge of the first coat. Sand with the 120-grit sandpaper when dry and apply a third coat for a smooth finish, using the 200-grit sandpaper for a paint-ready surface.
 Sand each coat when dry for a smooth, feathered corner.
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