Epoxy coating is a protective liquid layer applied to the surface of printed circuit boards or other objects after printing. This coating hardens to form a durable, waterproof, and chemical-resistant barrier that seals the object, preventing leaks, corrosion, and physical damage. In cybersecurity and electronics, epoxy coatings help protect sensitive components from environmental hazards, tampering, and unauthorized access, thereby enhancing the longevity and security of the device.