Prepainted gi Steel Sheet / PPGI / color coated galvanized steel sheet . Color Coated Corrugated Plate is steel that has gone through a chemical process to keep it from corroding.   The steel gets coated in layers of zinc oxide because this protective metal does not get rusty as easily.   The coating also gives the steel a more durable ,hard to scratch finish that many people find attractive.   For countless outdoor,marine,or industrial applications, galvanized steel is an essential fabrication component.