FS SEALER PLUS is a ready-to-use, water-based blend of silanes and siloxanes that delivers deep-penetrating water repellency and impregnation for porous natural stone and mineral surfaces. Reacting with substrate moisture, it forms an invisible active barrier that reduces water absorption while preserving breathability. The formulation provides fast water repellency, alkali resistance, and a tack-free finish within 48–72 hours, covering 30–60 sq ft per litre.