That's an excellent question for anyone responsible for maintaining a welcoming and durable public space. There's no single universal timeline, as it depends heavily on climate, wood type, and usage. However, a good general rule is to inspect wooden park benches thoroughly every 1 to 3 years, with refinishing or repainting typically needed every 2 to 5 years.
Think of the finish as the bench's protective skin. You should plan to refinish or repaint when you see clear signs of wear: the wood looks gray, dry, or cracked; the existing paint is chipping or peeling; or water no longer beads up on the surface. In harsh coastal or extreme sun environments, you might need to do this more frequently. Benches in sheltered, temperate areas may last longer between treatments.
The process is straightforward but vital. First, clean the bench thoroughly. If repainting, scrape off loose paint and sand the surface. For a transparent finish, sanding removes the gray weathered wood. Then, apply a high-quality exterior-grade sealant, stain, or paint designed for outdoor wood. This protective layer shields the wood from moisture, UV rays, and wear, preventing rot and splinters and significantly extending the bench's life.
Proactive maintenance is key. Regular cleaning and addressing minor damage promptly can stretch the time between major refinishing projects. By following this mindful approach, you ensure your wooden benches remain safe, attractive, and functional for your community to enjoy for many years.