Concept: Bituminous Primers: Bitumen Primer is commonly used for priming concrete and masonry surfaces prior to the application of the first mopping coat of melted bitumen in laying built-up roofing or membrane waterproofing, so as to promote the bonding of the bitumen with the concrete roof deck or masonry surface. Bituminous primers are generally prepared on road sites by mixing penetration bitumen with petroleum distillate. Cutback Bitumen: It is defined as bitumen whose viscosity has been reduced by the addition of volatile dilutants. Modified Bitumen: It is defined as a heavy roofing material employing multiple layers of asphalt and reinforcers around a core of plastic or rubber modifiers. Bitumen Emulsion: It is defined as a bitumen emulsion is a liquefied type of bitumen with a low viscosity. By dispersing bitumen in water and adding an emulsifier, ordinary bitumen turns into a low viscosity liquid that can easily be used in a variety of applications, including repairing and maintaining roads, waterproofing, spraying, etc.