 If such a vehicle is subsequently imported into a country with high rainfall, cold winters and where salting of the roads is common, application of underseal is strongly recommended to ensure the vehicle has a long life.When concrete on streets, parking lots, or warehouse floors begins to degrade, there are a few methods of repair available.Concrete undersealing is a process by which hot asphalt is pumped underneath the concrete slab so it flows into patches that were hollow and eroded.