Ideally, it's best to stain your dock once per year. Applying stain doesn't just keep it looking nice and new; it also helps extend the dock’s lifespan. Since you want to ensure water levels are at their lowest, it's best to have this project done by a professional dock repair service in the cooler autumn or early winter months. 

The best way to protect a deck is to prevent damage from UV light, water, mold, mildew, insects, and abrasive cleaning methods. Sweep regularly to prevent debris that hides bugs and traps moisture that can result in mold or mildew growth. Use a deck cleaner once a year to remove algae, mold, and mildew. Avoid using pressure washers on high, as they can damage the wood. Applying a deck sealant can protect the wood from UV and water damage, and adding shade can also reduce sunlight damage.

Pressure-treated wood lasts at least 10 years, but with the right care and treatment, it can last as long as 40 years. Painting the boards is one way to increase the lifespan of pressure-treated wood. The layer of paint provides extra protection for the wood against the exterior elements and insects.

You have a couple of options when choosing a durable pool deck coating. Epoxy is common and offers excellent stain and water resistance. Epoxy also withstands high temperatures and UV lighting, making it ideal for sunny spots. You can also add a coating to cement, which significantly lowers the temperature of the concrete, is environmentally safe, and makes cleanup a breeze.