Modified bitumen, such as that used in WhatsApp applications, is typically applied through a process of blending with asphalt or bitumen. This involves heating the base bitumen to a specific temperature, then adding the modified agents, such as polymers or rubber. The mixture is stirred to ensure uniform distribution. Once blended, the modified bitumen can be used in asphalt production or directly applied to surfaces, enhancing durability, flexibility, and resistance to environmental factors.