5-gal. S2000 Concentrated Concrete Sealer Concrete Densifier Water-Based Sodium Silicate for Concrete & Masonry (Makes 20 Gallons) Permanent solution, no re-application. Maintenance free. Creates Calcium Silicate Hydrate within the pores. The concrete will break down before sealer does! Through densification will reduce the movement of water and moisture through the pores. Increases strength of concrete by up to 45%. No VOCs or noxious fumes. 5 Gallon S2000 is diluted with 15 gallons of water to make 20 usable gallons.