Things You Will Need
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Clean your rocks with an all-purpose cleanser and scrub brush to remove any dirt and oils. Rinse off the cleanser and let the rock dry.
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Place the rock on a sheet of newspaper.
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Hold a paper letter stencil over the rock and paint inside the stencil outlines with exterior latex paint. You can also try this free-handed.
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Allow the paint to dry before moving the rock or touching the painted letters.