Waterproof sealant based on concentrated dispersion of modified rubber with special resins, glass fibers, and reinforcing agents. Upon drying, it forms a layer that adheres firmly to the substrate. It is impermeable and also has the necessary elasticity (movement up to 1 cm), which allows for the expansion and contraction of materials used in construction. The sealant adheres to any substrate. It resists solar and UV radiation, is waterproof, and can be loaded. After drying, the sealant can be painted as desired. Thanks to the practical cartridge packaging, application is very easy with a standard silicone gun.