My short answer: choose a low-maintenance park bench made from marine-grade recycled plastic, teak, or powder-coated aluminum. If I were choosing a bench for coastal salt air, I’d go straight to maintenance-free materials. My favorite is a marine-grade recycled plastic bench. Brands like POLYWOOD or Trex Outdoor Furniture make heavy, UV-stabilized boards that won’t absorb salt, won’t splinter, and never need painting or sealing. Salt spray rinses off with a hose, and the hardware is usually stainless steel.
If you want a classic park bench look, choose a solid teak park bench. Not all teak-look benches are equal—look for solid teak construction. Teak has natural oils that handle salt air well, and it ages to a silvery gray without structural damage. You may rinse it occasionally, but it won’t rust. Make sure the bolts and brackets are marine-grade stainless steel.
A powder-coated aluminum bench is another solid low-maintenance option. These benches are lightweight but sturdy, and the coating resists corrosion. The weak point is usually scratched coating, so pick a thick powder coat or touch up scratches quickly. Avoid hollow steel, cast iron, or untreated pine; they either rust or rot quickly near salt water.
Extra tips: use stainless steel or galvanized anchors, avoid placing the bench where saltwater pools directly on the surface, and rinse it monthly if possible. That will keep even the best coastal bench looking good for years.