The short answer is: it depends entirely on the material. Forgetting to cover your furniture during a rainstorm doesn't automatically spell disaster, but it significantly increases the risk for certain types. Here’s what you need to know.
Traditional wrought iron and steel furniture are highly susceptible to rust when exposed to prolonged moisture. Even with protective coatings, scratches or chips can expose the raw metal, leading to corrosion that weakens the structure and causes unsightly staining.
However, many modern urban outdoor pieces are designed for resilience. Aluminum furniture, especially powder-coated aluminum, is highly rust-resistant. It forms a protective oxide layer, making it an excellent low-maintenance choice. Similarly, furniture made from stainless steel (particularly grades 304 or 316), synthetic resins (like polypropylene), teak, and powder-coated metals offer strong resistance to rust and weathering.
To prevent rust, first identify your furniture's material. For vulnerable metals, ensure protective coatings are intact and reapply sealant as needed. While using waterproof covers is ideal, choosing inherently rust-resistant materials from the start is the best strategy for worry-free urban outdoor living. Regular cleaning to remove acidic pollutants and moisture is also crucial for longevity.