Step 5: Sand the walls for a smooth surface.
Use a sanding block or a piece of fine sandpaper stapled to a wooden block. Hold the block flat against the wall and sand away bumps, imperfections and paint drips. Sand the dried spackle until it, too, is smooth. If you are painting gloss or semi-gloss surfaces like doors or windows, sand these areas to ensure that the paint will bond.
 Sand gloss and semi-gloss surfaces.
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