Bronze is ideal for exterior use because of its resistance to corrosion and its ability to take a fine, aesthetically pleasing finish. However, when the protective coatings of wax are not maintained they will eventually be lost, leaving your sculpture unprotected from the influences of the environment.
For a minimum clean, you can use a soft cloth, feather duster, or soft-bristle brush. Never use a chemical cleaner or metal polish on your sculpture as doing so will damage the finish, often very severely impairing the sculpture.
For an indoor bronze maintenance once a year is recommended (Twice a year if in a humid or corrosive environment).
For outdoor bronzes maintenance twice a year is recommended. Humid or acidic areas require three or four times a year. Blacks, reds, or golden brown bronze sculptures should be waxed on a sunny day when the bronze is warm. Greens, granites and marbled patinas, should be waxed in the mornings or when the bronze is cool.
• Wrap the metal of the paint brush with tape to avoid scratching the sculpture.
• Using a soft clean dry cotton cloth, wipe the bronze sculpture free of dirt. If there are any contaminants such as food or fingerprints, use a damp cloth with water only and gently rub the sculpture – ensure the surface of the bronze is dry prior to waxing.
• Open your wax and lay the bristles across the wax using a sweeping back and forth motion, about 3 or 4 times will do the job. Place a super thin layer of wax onto the sculpture using a circular motion. The surface will begin to look matt not shiny. If it is a small sculpture continue to do the entire surface. If it is large, do one smaller area at a time. Allow the wax to dry to a haze (follow the times stated on the wax can). Using a clean cotton cloth begin gently rubbing the surface until the desired shine appears. Work the cloth in a circular motion on large smooth areas of the sculpture. You can repeat this process one or two more times.