Fusion-bonded epoxy coating is like putting a special kind of paint on metal things to make them last longer. Imagine you have a toy car made of metal, and you want it to look shiny and new for a long time. So, you take this special kind of paint that sticks really well to metal and put it all over the toy car.
Now, the paint has a special power to protect the metal from things that could hurt it like water, rust, and scratches. The paint is like a big, strong shield that keeps the metal safe from all these things that can cause it to not look so good or even make it break down.
So, when you put this special kind of paint on big metal things like pipes or tanks that are used for things like water or oil or gas, it makes them last longer too! People use it to keep things safe and sound so they don't have to keep fixing them or getting new ones all the time.