Creating metal sculptures that resist biological growth, such as mold, algae, or lichen, requires careful planning and execution. The key lies in selecting the right materials, applying protective coatings, and maintaining the artwork properly.

1. Material Selection: Opt for corrosion-resistant metals like stainless steel, bronze, or aluminum. These materials naturally deter biological growth due to their non-porous surfaces and durability.

2. Protective Coatings: Apply specialized coatings such as powder coatings, epoxy, or clear sealants. These barriers prevent moisture accumulation, which is a primary cause of biological growth.

3. Design Considerations: Avoid flat, horizontal surfaces where water can pool. Incorporate sloped or textured designs to encourage water runoff and reduce dampness.

4. Regular Maintenance: Clean sculptures periodically with mild detergents or specialized cleaners to remove organic debris. Inspect for early signs of growth and address them promptly.

5. Environmentally Friendly Additives: Some artists incorporate antimicrobial additives into coatings or patinas to further inhibit biological growth without harming the environment.

By combining these methods, artists can create stunning metal sculptures that remain pristine and resistant to biological growth for years, even in outdoor settings.