Mineral Shield is an invisible top coating that locks and protects beautiful Romabio mineral paint finishes from natural patina or water-borne weather. *Prevents the growth of algae, moss and mold to make paint look as sharp as possible *Repels water, as well as reduces patina to protect your paint job. *Invisible clear coating so you can set it and forget it without discoloring your surfaces while also reducing staining from clay, dirt and grass in outdoor environments.