Metal roofing has to be painted to protect against rust and corrosion. Over time, exposure to the elements can cause metal roofs to degrade, leading to leaks and other issues. Paint provides a protective layer that helps to prevent rust and extends the lifespan of the roof. Additionally, painted metal roofs can reflect heat and UV rays, reducing energy costs and keeping the interior of the building cooler. Choosing the right paint and application method is crucial to ensuring a durable, long-lasting finish.