Nissan Primastar barn doors roof spoiler is made of high-pressured Hard Polyurethane and NOT Polyester. Polyurethane is a more durable and expensive material with easy and excellent fitting. All spoilers are produced in aluminum constructed molds for increased quality and endurance in mass production. They are tested for durability in high temperatures as well as for aerodynamic efficiency and designed to the finest detail. The barn doors roof spoiler of Nissan Primastar comes un-primed. The product will need to be primed and then painted the color of your choice.