Powder coating extrusion requires the engineer’s consideration of the raw material chemistry and how each extruder parameter affects the powder’s behavior during compounding. Prior investigations reviewed how changes in extrusion parameters and conditions can affect the coating’s aesthetics and performance. New details in powder coating extrusion processing conditions and formulation chemistry allow the engineer to achieve specific coating characteristics. This study will be an update on the recent developments of long-term weathering exposure of high-performance powder coating topcoats on metallic substrates. Along with accelerated weathering (ASTM D4587), scanning electron microscopy (SEM-EDX) and electrochemical impedance spectroscopy (EIS) were employed to examine the coating’s appearance and performance. These findings will contribute to refining the industry’s knowledge to distinguish key parameters for outstanding long-term performance for topcoat systems.