Sika®-1 Waterproofer is an aqueous solution containing complex colloidal silicates. In the presence of water these swell and block the capillaries and pores in the applied sand cement renders, screeds and mortar to provide an effective water barrier against the transmission of liquid water. Sika®-1 Waterproofer can be used alone as an admixture or as a waterproofing system when used in conjunction with the Sika®-1 Pre-Bagged, Spritz, Render, Screed and Finishing Mortars.