How does painting of an iron grill prevent it from rusting?

Painting an iron grill creates a protective barrier that prevents moisture and oxygen from coming into direct contact with the metal, which are essential for the rusting process. The paint acts as a sealant, blocking corrosive elements like water and air. Additionally, high-quality paints often contain anti-corrosive properties that further enhance protection against rust. Regular maintenance and repainting can help prolong the life of the iron grill.