Most bronze used in casting sculptures today is composed of 95% copper. Because of this, bronze castings and their patina finishes tend to darken with age.
Proper care can help maintain the beautiful patina surface that originally graced your sculpture.
Bronzes that are placed indoors require minimal maintenance. Many newer bronze finishes have been sealed with a synthetic lacquer finish and subsequently sealed with a coat of wax, producing a shiny wax finish.
A thorough dusting and wiping away fingerprints with a clean, dry, cotton cloth is usually the only basic maintenance required
In a relatively dry climate, low in pollutants, and a super thin coat of Trewax® Brand Paste Wax should be applied once a year, or even every other year.
Never use spray or liquid furniture polishes to dust or clean a bronze sculpture. These polishes may contain oils which could damage the original patina finish.
In climates with higher humidity, or if you live where there is a higher concentration of airborne pollutants, cleaning and waxing may be needed twice a year.
Keep your brushes separately in labeled bags, free from other contaminants, for future use. Using a clean, dry, cotton cloth, gently rub in a circular motion, the dried wax from the bronze surface until you achieve the desired shine.
To achieve a better protective coating, you may want to re-apply a second coat using the same technique.
Outdoor bronzes require a maintenance program which keeps their surfaces clean and waxed on a regular basis.
Antique Bronze Finishes
Most older bronzes, that have been indoors, already have darkened patina finishes that have become stabilized by time. It is not necessary to clean and re-wax these surfaces as often.
WARNING: Waxing an older patina may disturb the overall character of the long acquired antique beauty. These should be evaluated by a qualified conservationist who specializes in this area. Attempts by others, to clean or wax antique bronzes, may decrease their value and damage their finishes.
Do not use brushes that you have used for other purposes as chemicals may remain in the bristles and if transferred to the patina finish, may cause permanent discoloration.
The Care of Bronze Sculpture Recommended Maintenance Programs by Patrick V. Kipper. Published by Path Publications in conjunction with Rodgers and Nelson Publishing Co.