Abstract: To better understand the dirt pick-up resistance （DPUR） mechanism and main influential factors of exterior paints， the JMP software was utilized to design the experiment. All the sample panels were put outside for natural exposure to study the influence of binder type， extender， additives and different PVC levels on the DPUR performance. In addition， the surface structure and physical properties of the paints were assessed by using scanning electron microscope （SEM）， EDX analysis and contact angle measurement. The results showed that the main parameters responsible for DPUR is the choice of binder and the PVC level as well as the interaction thereof. The long-term exposed surface was slightly degraded and easy to be polluted. The film surface was more hydrophilic.
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