A method for treating a polymer vessel, comprising treating a surface region of the vessel by exposing the surface region to a high-frequency plasma； and coating the surface region of the vessel with a lasting water-based edible coating. A vessel treated in accordance with the method. The method may include placing the vessel on a conveyor, a robotic arm or system to facilitate the movement of the vessel through the high-frequency plasma device. Including rotating the vessel to treat different parts thereof.
