Romabio Mineral Shield GallonMineral Shield is a non toxic, invisible coating that locks and protects beautiful Romabio mineral paint finishes from natural patina, or weathering created by water. The breathable coating repels water droplets but still allows water vapor to pass through, protecting the painted surface and preventing the growth of algae, moss, and mold. Unlike other products, Mineral Shield will not change the sheen of the finish or texture of the surface, thus