Modified bitumen adhesive is typically applied using a hot-melt process, where the adhesive is heated to a specific temperature to achieve optimal viscosity. It can be sprayed, poured, or spread onto the surface of the asphalt or bitumen. This adhesive enhances the bonding properties and flexibility of the modified material. Proper surface preparation is essential to ensure effective adhesion, and the application should be done in controlled conditions to maintain the integrity of the modified bitumen.