If you're furnishing a space near the coast, finding outdoor benches that can stand up to the salty, corrosive air is a top priority. Standard steel benches will succumb to rust quickly in this environment. Your best options are benches specifically engineered for marine or coastal conditions.
Your top choices are benches made from Marine-Grade Aluminum (specifically 5052 or 6061 alloys). This material is naturally rust-proof, incredibly lightweight, and requires almost no maintenance. It's the gold standard for coastal durability. Stainless Steel Benches (Grade 304 or, better yet, Grade 316 "marine-grade" stainless) are another excellent, though often heavier, option. The higher chromium and nickel content, especially in Grade 316, provides superior resistance to saltwater corrosion.
For a low-maintenance alternative, consider High-Density Polyethylene (HDPE) or Recycled Plastic Lumber benches. These are completely impervious to rust, won't rot or splinter, and are often made from recycled materials. Powder-Coated Aluminum or Steel can also be viable, but ensure the coating is a high-quality, UV-stable polyester or fluoropolymer specifically rated for coastal exposure. Avoid cheap, thin coatings.
When selecting your bench, prioritize materials over style. Look for robust, welded construction, hidden fasteners, and finishes designed for salt spray. While the initial investment is higher, choosing a truly rust-resistant bench will save you significant money and labor on replacements and repairs for years to come, allowing everyone to enjoy the view without worrying about deteriorating furniture.