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These stores also carry a variety of paints, water sealers, finish glosses and brushes that are suitable for painting unglazed pots.   Use a chisel to gently chip the seams off or sand them lightly with fine to medium grade sandpaper. This step is necessary for a smooth surface, and the paint will adhere better if you lightly sand it first. You can also blow off any dust and dirt with a hair dryer.   A sealer will help prevent moisture from soaking through the pot, which could ruin the outside finish.  The primer helps the final coat of paint adhere and it covers any small imperfections or discolorations.  Use the best brush you can afford; the bristles on cheap brushes invariably come loose and get stuck in the paint.
Purchase unglazed ceramic pots at a craft store. Choose a work area that is well-ventilated. Cover your work surface with plastic or newspapers to protect it. Remove seams on the pot that were created from the mold. Brush the pot off with a soft paint brush or a dry cloth. Wipe the pot down with a damp cloth. Allow the pot to dry completely. Spray the inside of your pot with a waterproof sealer. Let the sealer dry completely. Apply a primer to the ceramic pot using a paintbrush. Let the primer coat dry completely. Brush a thin coat of acrylic paint on the entire pot. Allow the paint to dry. Apply another thin coat of paint to the ceramic pot and let it dry. Use a thin coat of acrylic gloss to protect the paint. Allow at least 24 hours of drying time before you put soil in the pot.