HeatShield contains an additive that reflects up to 80% of the suns solar energy. This means the surface it's painted on - typically a roof, but also pavements, walls and vehicles - remains a lot cooler. When painted onto a roof it reduces the internal temperature of a building. Thus savings on cooling costs and reducing our carbon footprint. The surface or structure it's painted onto lasts a lot longer because it's not exposed to extremes of heat. Suitable: for external metal roof structures where moderation of temperature extremes is required. Reduces heat absorption. Waterproofs and protects. Flexible - allows for contraction and expansion. Easy to apply - Brush or roller application. Can be applied to previously painted surfaces. Fast drying. Prolongs life of roof repairs.