Coverage 20-30m2 per liter. The product is used undiluted. Durability: 15 yearsWater-based neutral impregnation of high quality and long durability. Stonetreatment Neutral impregnation is based on the fluoroacrylic polymer technique and gives natural stone great resistance to both oil and water-borne contaminants, without the stone’s appearance deteriorating or changing. The product is open to diffusion and can be used both outside and inside.