Porous stone sculptures are highly susceptible to surface erosion due to their absorbent nature, which makes them vulnerable to weathering, pollution, and biological growth. To preserve these artworks, several effective methods can be employed.

1. Sealing with Penetrating Sealants: Applying a high-quality, breathable sealant helps repel water and contaminants while allowing the stone to "breathe," reducing erosion risks.

2. Regular Cleaning with Gentle Techniques: Use pH-neutral cleaners and soft brushes to remove dirt without damaging the stone’s surface. Avoid harsh chemicals that can accelerate erosion.

3. Protective Coatings: Wax or acrylic-based coatings can provide an additional barrier against moisture and pollutants, though they may require periodic reapplication.

4. Controlled Environmental Exposure: Limit exposure to direct rain, wind, and extreme temperatures by placing sculptures under shelters or indoors when possible.

5. Biological Growth Prevention: Treat the stone with anti-algae or anti-fungal solutions to prevent organic growth that can weaken the surface over time.

By combining these methods, porous stone sculptures can remain intact and visually stunning for generations. Regular inspection and maintenance are key to long-term preservation.