In Water. A less common environment for galvanized steel is submerged in or exposed to water. Moisture is highly corrosive to most metals including steel and zinc.Click to see full answer. Thereof, how long will galvanized steel last underwater?It is common for hot-dip galvanized steel to perform flawlessly in seawater for eight to twelve years.Additionally, is galvanized steel water resistant? Galvanized steel is regular steel sheets that have been coated in zinc to make them corrosion resistant. Regular steel is made of iron which will rust when exposed to moisture, either in the form of rain or ambient humidity. Switch to a metal that will not corrode when exposed to water. Similarly, how long does it take for galvanized steel to rust? The zinc coating of hot-dipped galvanized steel will last in the harshest soil is 35 to 50 years and in less corrosive soil 75 years or more. Although humidity affects corrosion, temperature itself has less of an impact. Galvanized zinc coatings respond well in extreme cold and hot temperatures.Can Galvanised Steel be painted?Galvanized metal is difficult to paint because it’s coated with a layer of oil to prevent white rust. Alkyd and oil-based paints may seem to stick at first, but the oily layer eventually “sheds” the paint. Metal paint, preferably the same brand as the primer. Look for a brand specially designed for galvanized metal.