General description Natural Stone Sealer with a 'DRY' Invisible Finish is an effective impregnating sealer designed for sandstone, limestone, granite, and slate. This high-quality, clear, solvent-free acrylic coating system alters the chemical structure of porous stones, providing an excellent water-repellent and stain-resistant surface. It is resistant to algae, lichen, and staining, making it suitable for both external and internal applications. Technical specifications Type: Solvent-free acrylic impregnating sealer Finish: Dry invisible finish Coverage: 1st coat 4 - 8 m² per litre (4m² for Sandstone, 8m² for Slate & Granite); 2nd coat 8 - 16 m² per litre Touch dry: 2 - 3 hours Fully waterproof: 24 hours Shelf life: 12 months (in original sealed container); use within 3 months once opened Installation Pre-treat the surface with an appropriate cleaning product. If necessary, clean the surface using a pressure washer and allow it to dry for at least 3 days. Ensure the area is clean,