How to Resurface Faux Rock

Clean the rock thoroughly, particularly if it has been used outdoors. Use a small amount of dish detergent dissolved in water, and scrub with a clean, disposable rag. Allow the rock to dry thoroughly.

Sand the rock using a 240-grit sandpaper. Continue sanding until the entire surface of the rock has a slightly rough texture and a dull appearance. Wipe away any sanding dust with a slightly damp rag.

Cover a large flat surface in a well-ventilated area with newspaper. Place the rock in the center of the newspaper.

Spray the rock with a layer of stone textured finish spray paint, following the manufacturer's instructions. Select a paint color that is similar to the desired shade of your completed rock.

Select the paint colors for your finished rock. Use a high-quality, water-based latex paint. You will need three separate colors for your rock -- a base color, a highlight color and a finish color. For your base color, select either a light tan or a dark brown. Highlight colors give depth and interest to the rock. Choose red, gray, green or yellow. For the finish, use either white or black. Black is a more natural choice, but white can also yield interesting results, if used in moderation.

Fill each of three spray bottles with one cup of water. Add 1/4 cup of your base color to one bottle, 1/4 cup of highlight to another and 1/4 cup of your finish color to the last bottle. Close the bottles tightly, and shake vigorously to mix. Set the bottles to "Mist." Do not use the "Spray" setting.

Spray a thin, patchy coat of your base color onto the rock. Let the rock sit until it is dry to the touch -- it does not need to be completely dry, only dry enough to prevent mixing with other colors.

Repeat the process of spraying and drying with the other bottles. Continue to add blotchy layers of paint until you have achieved your desired result. Remember that more, thinner coats appear more natural than fewer, thicker coats.