Congratulations on your new wooden park benches! Protecting that fresh, beautiful wood is crucial for ensuring they last for years to enjoy. The right sealant is your best defense against sun, rain, and wear. For maximum durability in a public setting, I highly recommend a high-quality oil-based penetrating sealant or a hard-drying film-forming sealant like a marine-grade spar urethane.
Oil-based sealants, such as those with a linseed or tung oil base, soak deep into the wood grain, providing robust water resistance and enhancing the natural beauty. They are excellent for repelling moisture. For a tougher, clear protective coat that withstands heavy use, a spar urethane is fantastic—it's flexible to handle wood movement and contains UV blockers to prevent graying.
Alternatively, a high-performance water-based acrylic-urethane hybrid offers easier cleanup, faster drying times, and low odor, which is great for public spaces. Look for products specifically labeled for "exterior," "deck," or "marine" use. Always ensure the wood is completely clean, dry, and sanded smooth before application. Apply at least two thin, even coats according to the manufacturer's instructions, paying extra attention to end grains where moisture enters most easily. With proper sealing and occasional maintenance, your benches will remain a welcoming community asset season after season.