Polyurea is two pack system, and it comes aliphatic and aromatic. These are robust coating; it protects the surface and prevent the water leak. Aliphatic system has an open time 10-20 minutes once it is mixed it should be applied in 10-15 minutes. It dries and cure less than 45 minutes. The aromatic system has zero minutes open time, it never mixed, it only get mixed when it comes from two separate nozzles and mixed at a few seconds before it was sprayed is applied with a cartridge gun for a small size job and for extensive coating in a concrete pit, or a large size warehouse floor or for the insulation a two-pack pressure highly controlled and regulated machine is used.