Smartseal's Natural Stone Colour Enhancer is a superb impregnating sealer which can be used on a range of hard surfaces, including but not limited to sandstone, granite, limestone, Indian sandstone and slate. This product will provide a colour enhanced finish which will bring out the original colour of the stone to make it look fresh and brand new. With a lifespan of up to 5 years, this product which will protect you against a range of organic growth like algae, moss and lichen spores. By altering the chemical structure of the stone which is porous, an excellent water repellence and stain resistance are created.