The Q-Railing Easy Glass Prime Top Mount Aluminum Matte Black system is outdoor-rated — it is designed for use on balconies, terraces, and other exterior applications. However, installing it on a boat introduces additional challenges: while the aluminum base channel with matte black finish is corrosion-resistant, it is not specifically engineered for marine environments with constant saltwater exposure. For boats, you’ll want to confirm marine-grade anodization or stainless steel alternatives.