How Powder Coating Works

Since its creation, powder coating has quickly risen in popularity and is on track to replacing paint and other liquid finishes as the most common way to protect and decorate furniture, cars, and many other items. It is a brilliant but surprisingly simple process that is easy to do, but it can be difficult to understand how it works. Here’s a quick explanation of the science behind the world’s fastest-growing finishing process.

Simply put, powder coating is a finishing process that involves spraying a powder over an item and then using heat to bind the small particles together to form a durable, lasting, beautiful finish.

The powder itself is a mixture of different ingredients that are melted, mixed, cooled and ground to form a powder. Color pigments, specialized resins, and other fillers such as leveling agents, flow modifiers, and curing agents are combined together to form the powder that is applied to the object. The powder has a consistency similar to baking flour.

The application process is surprisingly simple. It relies on electric charges to attract the powder to the part that is being coated. Here is a breakdown of the required steps:

Once the part has been coated with the powder, it must be cured. Before it is cured, the powder can be easily brushed off of the surface (which makes fixing mistakes very easy to do — unlike with paint). The most common method of curing the powder is to introduce it to temperatures of around 375° Fahrenheit. When the powder reaches that temperature, it melts and binds together to form a finish that is stronger, longer-lasting, and often times more beautiful than paint or other liquid finishes.

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