Which technique can improve the durability of elevator doors?

Applying a protective coating to elevator doors enhances their durability by creating a barrier against environmental factors such as moisture, corrosion, and abrasions. The protective layer can prevent rusting and deterioration, particularly in environments that may expose the doors to harsh conditions, such as high humidity or chemicals.

Additionally, protective coatings can improve the aesthetic appearance of the doors, ensuring they maintain a clean, polished look over time. This technique helps extend the lifecycle of the doors while also reducing maintenance costs, making it a highly effective method for improving durability in elevator systems.