The key process parameters influencing modified bitumen peel and stick performance include the temperature during application, the viscosity of the modified bitumen, and the surface preparation of the substrate. Optimal application temperature ensures proper adhesion, while the viscosity affects the flow and bonding characteristics. Additionally, a clean and properly prepared substrate enhances adhesion, reducing the risk of delamination. Monitoring these parameters is crucial for achieving effective and durable bonding in asphalt applications.