Waterproofing of these building blocks is considered essential to avoid the problems of water leakage and inflow into these areas. Sealing must be carried out by specialized personnel from the inner or outer surface. Cement based sealants have many advantages and are suitable for many concrete applications such as:

• Underground walls and floors
• Drinking water tanks
• Swimming pools
• Biological cleaning tanks
• Concrete irrigation pipes
• Port works
•  Fountains