Gp base Colour Coil is a type of steel coil that is coated with a layer of color paint over a galvanized substrate. The galvanized substrate provides the base metal with superior corrosion resistance, while the color paint adds aesthetic appeal to the product. GP Base Color Coil is commonly used in roofing and cladding applications in the construction industry. The color paint layer can be applied using various methods, including coil coating and spray coating.