If you want your wooden park bench to stay looking good through rain, snow, and blazing sun, the short answer is: apply a high-quality sealant every one to two years. But the exact frequency really depends on the weather where you live and the type of wood your bench is made from.
For most softwoods like pine or cedar, I recommend a fresh coat of sealant once a year, preferably in late spring or early fall. That’s when the weather is mild—temperatures between 10°C and 25°C (50°F to 77°F) are ideal—and the wood is clean and dry. If you live in a particularly harsh climate with heavy rain, intense UV rays, or freezing winters, your bench may need a second application or a more durable spar varnish. On the other hand, hardwoods such as teak or mahogany naturally resist moisture and rot; they can often go two years between sealings.
Here’s a simple rule of thumb: do the water test. After a rain, sprinkle a few drops of water on the bench. If the water beads up and rolls off, your sealant is still working. If the water soaks in and darkens the wood, it’s time to reapply.
Don’t forget to prepare the surface properly before sealing. Clean the bench with a mild wood cleaner or a 50/50 vinegar-water mix, let it dry completely, and lightly sand any rough spots. This small step makes a huge difference in how well the sealant adheres and how long it lasts.
In short: aim for yearly maintenance, adjust based on your local climate, and always trust the water bead test. Your bench will thank you with years of beautiful, weather-resistant charm.