Step 4: Apply and sand a finish coat
Cover any imperfections with a final coat of compound. First wet the patched area with a sponge to keep it moist and provide a good surface for the spackle. Apply the next coat with a 2-inch putty knife and scrape smooth. Allow the compound to dry completely and sand with a 200-grit sandpaper for a smooth surface. Wipe away any dust before priming and painting to match the wall.
 Apply a second coat of compound to the dampened surface.
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