A+, when applied to metal surfaces, helps to reduce the existence or growth of bacteria because it is a non-nutrient. A+ also dries hard and clear, creating a barrier. A+ is Mold Resistant and is applicable to homes prone to hurricanes, storms, and flooding, and is Fire Resistant. A+ is good for pipes and all metals as it prevents corrosion. Use on automobile chassis to prevent rust. Use on boats and Jet Skis to prevent barnacles and to keep vessels shiny and clean - remove from the ocean and just hose off. A+ prevents costly marine maintenance for at least 5 to 6 years! FREE SHIPPING WITHIN U.S. & TERRITORIES! A+ is 100% 'Green' and environmentally friendly!