Thermal stress cracks in stone sculptures are a common issue caused by rapid temperature changes, leading to expansion and contraction of the material. To prevent these cracks, consider the following effective methods:

1. Choose the Right Stone: Opt for stones with low thermal expansion coefficients, such as granite or basalt, which are less prone to cracking under temperature fluctuations.

2. Control Environmental Temperature: Avoid placing sculptures in areas with extreme temperature variations. Indoor displays or shaded outdoor locations are ideal.

3. Use Protective Sealants: Apply high-quality sealants to reduce moisture absorption, which can exacerbate thermal stress. Reapply sealants periodically for long-term protection.

4. Proper Installation: Ensure sculptures are mounted on stable bases that allow for slight movement, reducing stress from thermal expansion.

5. Regular Maintenance: Inspect sculptures for early signs of stress and address minor cracks promptly to prevent further damage.

By implementing these strategies, you can significantly extend the lifespan of stone sculptures and maintain their aesthetic appeal.