Great question. The best park bench paint to prevent chipping really depends on what the bench is made of, but the most common choices are exterior alkyd enamel, exterior acrylic latex enamel, epoxy paint, or powder coating.
For metal park benches, powder coating is usually the most chip-resistant finish. It is applied as a dry powder and baked on, forming a hard, fused shell that resists impacts, scratches, and rust. When a metal bench is repainted in the field, park maintenance teams often use a direct-to-metal alkyd enamel or a two-part epoxy paint because those products grip bare metal and dry to a tough, chip-resistant film.
For wooden park benches, the best anti-chipping options are a high-quality 100% acrylic latex exterior paint or an oil-based exterior enamel. Acrylic latex stays slightly flexible, so it expands and contracts with the wood instead of cracking and chipping. Oil-based alkyd enamel is very hard once cured, but it can become brittle over time. Many parks also add a clear urethane or spar urethane topcoat over the paint for extra impact resistance.
The real secret to preventing chipping is not just the paint itself. Surface prep matters a lot. On metal, the bench needs to be sanded, cleaned, degreased, and primed with a rust-inhibiting primer. On wood, it should be dry, sanded, and coated with an exterior wood primer. After that, two thin coats of paint work much better than one thick coat.
If you are repainting a park bench, look for exterior alkyd enamel, exterior acrylic latex enamel, or a direct-to-metal epoxy/alkyd product. Avoid cheap interior latex or general-purpose spray paint because those will chip and peel quickly outdoors.