Paint-on or spray-on galvanised coatings represent a method employed to protect metal surfaces from corrosion. This technique involves the application of a zinc-rich paint or spray to the metal surface. The zinc, a key component in the coating, provides a barrier between the metal and the environment, preventing corrosive substances from reaching the metal surface. In the paint-on method, the zinc-rich paint is applied using a brush or roller. This technique is often utilised for smaller projects or for touch-ups on larger galvanised surfaces. In contrast, the spray-on method involves the use of a spray gun to apply the zinc-rich coating. This method is typically used for larger projects, as it allows for a more even distribution of the coating and can cover a larger surface area more quickly than the paint-on method. Both methods require a clean, prepared surface for the coating to adhere properly. After application, the coating needs to dry and cure before the metal can be used. Once cured, the coating provides a durable, protective layer that can withstand harsh weather conditions, making it a popular choice for outdoor structures. While both methods provide effective protection against corrosion, they do not offer the same level of protection as hot-dip galvanising, where the metal is immersed in molten zinc. However, the paint-on and spray-on methods are more flexible and cost-effective, making them suitable for a wide range of applications.