Acid rain poses a significant threat to metal sculptures, causing corrosion and deterioration over time. To preserve these artworks, several effective strategies can be employed.

1. Protective Coatings: Applying a high-quality sealant or wax creates a barrier against moisture and acidic pollutants. Epoxy, polyurethane, or automotive-grade clear coats are excellent choices for long-term protection.

2. Regular Cleaning: Gently washing sculptures with distilled water and a mild detergent removes acidic deposits before they cause damage. Avoid abrasive tools to prevent scratches.

3. Material Selection: Using corrosion-resistant metals like stainless steel, bronze, or aluminum for outdoor sculptures reduces vulnerability to acid rain.

4. Sheltered Placement: Positioning sculptures under roofs or in semi-protected areas minimizes direct exposure to acid rain.

5. Routine Inspections: Checking for early signs of corrosion allows for timely repairs, preventing extensive damage.

By combining these methods, artists and collectors can significantly extend the lifespan of metal sculptures exposed to harsh environmental conditions.