PU(Polyurethane) is a reaction polymer of a polyol resin and an isocyanate hardener. PU paint provides durability, resistance to chemicals, water, abrasion, and temperature, as well as an attractive glossy finish. PU offers a tough and durable coating that is highly resistant to extremes of weather – intense sun, wind and precipitation. The polyurethane also allows the paint to be formulated to higher gloss levels, offering a beautiful and consistent finish. The higher gloss level also allows improved “self-cleaning” – that is, dirt and dust washes off during rain, and residual dirt can be easily removed by detergent and water. Graffiti can also be removed from the smooth surface using proprietary cleaning agents. Therefore, a polyurethane based paint is generally the best option for the long-term protection and decoration of a wide range of substrates. Usually, it applied over primer and intermediate coats.