When other waterproofing techniques fail miserably as a preventive measure chemical waterproofing commonly used. Before chemical waterproofing one needs to find and fix the source of water. Then apply coats of waterproofing chemicals like Dr. Fixit, Sika, zycosil, Pidilite, Sunanda, Asian Paints – Damp Proof, Asian Paints – Apex Ultima Protek, Dr. Fixit – Heat Shield.