Moisture accumulation inside hollow metal sculptures can lead to rust, corrosion, and structural damage over time. To preserve these artworks, several effective methods can be employed.

1. Proper Ventilation: Ensure small ventilation holes are drilled in inconspicuous areas to allow air circulation, reducing trapped humidity.

2. Desiccants: Place silica gel packets or other moisture-absorbing materials inside the sculpture to absorb excess moisture.

3. Sealants and Coatings: Apply rust-resistant sealants or wax coatings on the interior surfaces to create a moisture barrier.

4. Climate Control: Store or display sculptures in environments with stable humidity levels, ideally between 40-50% relative humidity.

5. Regular Inspection: Periodically check for signs of moisture or corrosion and address issues promptly.

By implementing these strategies, artists and collectors can significantly extend the lifespan of hollow metal sculptures while maintaining their aesthetic appeal.