Is the alumina coating waterproof?

The alumina coating is waterproof. Paint refers to a liquid or solid substance that can be coated on the surface of an object under certain conditions to form a film for protection, decoration or other special functions. It is usually composed of film-forming substances, pigments, solvents and additives, and mainly plays a special role in protecting, decorating, covering up product defects and improving product value, for example, as a protective coating on metal surface to prevent metal from being oxidized or corroded, or as an exterior wall coating to play a waterproof and decorative role.