Jamb Cover – Coated with Galvalume, which is a patented aluminum-zink alloy coating for extra protection. The panels are then bonderized, and an OPTIMA Primer is applied. The primer supplies flexibility and provides an excellent base for the final coat; CERM-A-STAR. This ceramic pigmented silicone polyester not only supplies strength, but also hardness and durability against the effects of sun, wind, rain, heat and cold. And it is extremely resistant to mildew. This also keeps the panel from blistering, peeling or flaking.