Micro-cracking in aged bronze sculptures is a common issue that can compromise both structural integrity and visual appeal. To prevent this, several effective methods can be employed.

1. Regular Cleaning and Maintenance: Dust, pollutants, and moisture accelerate corrosion and cracking. Gently clean sculptures with soft brushes and pH-neutral solutions to remove contaminants without damaging the patina.

2. Climate Control: Fluctuations in temperature and humidity cause metal expansion and contraction, leading to micro-cracks. Store or display sculptures in stable environments with controlled humidity (40-50%) and moderate temperatures.

3. Protective Coatings: Apply microcrystalline wax or specialized lacquers to create a barrier against moisture and oxygen. These coatings should be reapplied periodically to ensure continued protection.

4. Avoid Physical Stress: Handle sculptures carefully and avoid placing them in high-traffic areas where accidental impacts could initiate cracks. Use padded mounts for support.

5. Professional Restoration: For valuable or severely aged pieces, consult conservation experts. They can perform treatments like corrosion inhibition or structural reinforcement to halt further damage.

By implementing these strategies, collectors and conservators can significantly reduce the risk of micro-cracking, preserving bronze sculptures for future generations.