Metal sculptures, especially those displayed outdoors, are vulnerable to pitting and surface erosion due to environmental factors like moisture, pollution, and temperature fluctuations. To preserve their aesthetic and structural integrity, consider these proven strategies:

1. Protective Coatings: Apply specialized coatings such as wax, lacquer, or clear acrylic sealants to create a barrier against moisture and pollutants. For outdoor sculptures, marine-grade epoxy or polyurethane coatings offer superior protection.

2. Regular Cleaning: Remove dirt, salt, and debris with a soft brush and mild detergent. Avoid abrasive materials that could scratch the surface and accelerate corrosion.

3. Environmental Control: If possible, relocate sculptures to sheltered areas or use protective covers during harsh weather. Indoor sculptures benefit from controlled humidity levels (ideally below 50%).

4. Galvanic Protection: For large or critical pieces, sacrificial anodes (like zinc) can be installed to divert corrosion away from the sculpture itself.

5. Routine Inspections: Check for early signs of rust or pitting every few months. Address minor issues promptly with spot treatments to prevent widespread damage.

By combining these methods, artists and collectors can significantly extend the lifespan of metal sculptures while maintaining their original beauty.