Sculpture Source

Curt Brill: "Julie", bronze sculpture

Bronze is a popular metal for cast metal indoor or outdoor sculptures. It is an alloy, or a metal created by the combination of other metals, with a minimum of 90% copper for quality bronze sculptures and statues in the United States. Some common bronze alloys expand slightly just before they set, making them desirable for intricate sculptures because they can fill the finest details of a mold. A chemical patina is applied to give the final finish and color to the bronze, and it is the patina that needs to be maintained, as the metal itself will last thousands of years.

Outdoor bronze sculptures hold up well and are easy to care for. A bronze sculpture is usually protected by a coat of wax, which is applied when the metal is still warm so it can seep into the pores and act as a barrier to air and humidity. This helps keep the bronze from oxidizing and keeps it looking new longer. An outdoor sculpture that has fallen victim to bird waste and other debris can be cleaned with a bucket of mild soap and water. Too much soap can leave a residue that can be difficult to rinse, so use just enough soap to create bubbles.  Steer clear of exotic oils and cleansers, as they can remove the patina and alter the look of the sculpture. An old toothbrush can be used to scrub dirt out of the sculpture’s nooks and crannies. Rinse the sculpture with clear water after cleaning, and then allow it to dry completely before applying a coat of clear paste wax (formulas that contain a high concentration of carnauba wax are best). Use a soft, lint-free rag to apply a light coat and let it dry to teh touch before buffing to the desired finish.  Do this on a warm, clear (but not too hot) day to allow the wax to dry before the next rainfall. Depending on the weather and the exposure, waxing is needed between once and three times a year. Don’t forget that indoor air also contains pollutants and humidity, so you will need to wax your indoor bronzes once avery two or three years.