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Sand the bookcase, using circular motions, to remove the surface coat.
After the bookcase has been dusted to remove any dust residue, use black gesso (used to prepare artist canvas) to prime the surface of the bookcase. The black gesso is thick and helps to create a richer look on the surface of the wood.
When the primer has dried completely, apply semigloss Onyx paint to the surface of the shelves.
Benjamin Moore semigloss paint #2133-10 (Onyx)