Make your home stronger with this 5L Natural Stone Sealer by SmartSeal. This pack of two sealers is an effective impregnating sealer that can be used on various hard surfaces, including but not limited to sandstone, Granite, Limestone, Indian sandstone, and Slate. It leaves a totally dry finish, which is touch dry in two to three hours and waterproof in 24 hours. The chemical structure of the porous stone is altered, which will provide superb water repellence and a stain-resistant surface. It also offers a lifespan of up to five years, protecting you against a range of green growth like moss, algae and lichen spores. Also, you can apply a second light 'mist' coat if the stone allows: Sandstone – 5m2 per litre first coat - 7.5m2 second coat, Limestone – 8m2 per litre first coat - 12m2 second coat, Terracotta – 8m2 per litre first coat - 12m2 second coat, Travertine – 8m2 per litre first coat - 12m2 second coat, Slate – 8m2 per litre first coat - 12m2 second coat, Granite - 12m2 litre first coat - 16m2 per litre second coat.