How can I effectively seal plywood from moisture to prevent damage and prolong its lifespan?

To effectively seal plywood from moisture and prolong its lifespan, you can use a waterproof sealant or paint specifically designed for outdoor use. Apply multiple coats, ensuring complete coverage, and pay special attention to the edges and corners where moisture can seep in. Additionally, storing the plywood in a dry, well-ventilated area can help prevent moisture damage.