If you're looking for a very low-maintenance option for public outdoor benches, my top pick, without hesitation, is powder-coated steel.
Here’s why it stands out. Public benches face constant use and brutal exposure to sun, rain, wind, and temperature swings. Traditional materials like wood require regular staining, sealing, and repair of splinters. Concrete can crack and stain. Powder-coated steel, however, is a champion of durability.
The process involves applying a dry powder electrostatically and then curing it under heat, creating a finish that is far more resilient than standard paint. It resists chipping, scratching, and fading. You won't have to worry about rust, peeling, or the warping that plagues wood. Maintenance is incredibly simple: occasional cleaning with soap and water is typically all that's needed to keep it looking new for years.
Beyond being low-maintenance, it offers excellent design flexibility—available in countless colors and styles—and provides a sturdy, vandal-resistant seating solution. While the initial investment might be higher than some options, the near-zero upkeep costs and exceptional lifespan make powder-coated steel the most practical and cost-effective choice for a long-term, worry-free public outdoor bench.