Maltese stone sealer VP-1 - Waterproof sealer - wall treatment with exceptional water repellent properties. Reduces the absorbability of the substrate. VP-1 is a high-performance, penetrating silane/siloxane blended water-repellent that provides long-lasting water repellency on stone and limestone walls. This water-based product is breathable, does not form a film, and does not alter the color or appearance of the surface. Protects most external and horizontal stone surfaces above the level. The natural color of the substrate and surface structures are not altered, with little or no shine created. Slight darkening can occur on dense surfaces. We recommend testing before treating any surface to ensure desired results. This product is designed to protect, waterproof, and seal stone and limestone walls once properly cleaned. Improves resistance to dirt and efflorescence.