Mapei Mapesil AC is a premium sanitary-grade silicone sealant designed for flexible, waterproof sealing in tiled and wet area applications. Formulated with anti-mould technology, Mapesil AC is suitable for sealing joints between tiles, sanitary fixtures, glass, aluminium, and many common building materials. Its high elasticity allows it to accommodate movement and expansion while maintaining a durable waterproof seal. Available in a wide range of colours matched to Mapei grout systems, it delivers a clean, professional finish across tiling projects.