Nano Stone is a type of coating or sealant that can be applied to outdoor wall coverings to protect them from weathering and other forms of damage. The durability of Nano Stone will depend on various factors such as the quality of the product, the condition of the surface it is applied to, weather conditions, and how well it is maintained. Generally, it can last for several years, up to a decade, before needing to be reapplied. However, exposure to harsh weather, UV rays, and other environmental factors can decrease its lifespan.