Acid rain can significantly damage outdoor furniture, making it essential to choose the right finishes for protection. The best outdoor furniture finishes for acid rain-prone areas include powder coating, marine-grade varnish, and epoxy-based sealants. Powder coating provides a durable, weather-resistant layer that withstands acidic conditions. Marine-grade varnish, often used on boats, offers excellent moisture and acid resistance. Epoxy-based sealants create a hard, protective barrier against environmental damage. Additionally, oil-based finishes like teak oil can help maintain natural wood while offering some protection. Regular maintenance, such as reapplying finishes and cleaning surfaces, further enhances longevity. By selecting the right finish, you can ensure your outdoor furniture remains beautiful and functional despite acid rain exposure.