PPGL is pre-painted galvalume steel, also known as pre-coated steel, coil-coated steel, color-coated steel, etc., usually with hot-dip galvalume steel substrate. The term is an extension of GL, which is the traditional abbreviation for Galvalume Steel.The galvalume coating protects the base steel by providing cathodic and barrier protection. The paint coating acts as a barrier protection to the hot-dip galvalume coating, significantly reducing the corrosion rate of the alloy coating.