What are the best practices for applying outdoor wood polyurethane to protect and enhance the durability of wooden surfaces exposed to the elements?

To apply outdoor wood polyurethane effectively, follow these best practices:

1. Prepare the surface by sanding and cleaning it thoroughly.
2. Apply the polyurethane in thin, even coats using a brush or roller.
3. Allow each coat to dry completely before applying the next.
4. Apply multiple coats for maximum protection.
5. Consider using a UV-resistant polyurethane for added durability against sun exposure.
6. Reapply the polyurethane as needed to maintain protection.