Measuring the BADGE/JeffAmine wettability of Al surfaces. We measured the contact angle of BADGE/JeffAmine on aluminum and water-oxidized aluminum (2 hrs at 65°C, as described in the SI) to better understand the wetting behavior of the BADGE/JeffAmine polymer using a videobased optical contact angle measuring system. We observed that the cosθ (i.e., the surface energy) value is high (corresponding to a low contact angle), indicating a philic (wetting) solution, as shown in Figure . Interestingly, the wettability of the fully water oxidized aluminum layer was higher (or better), initially suggesting a more favorable substrate than aluminum. It can be due to a contribution of surface roughness and/or porositiy changes of the alumna film formed. Both surface characteristics, surface roughness and porosity, are known to control wetting. Therefore, we conclude that the apparent increased BADGE/JeffAmine wettability of fully water-oxidized Al is due to pores, assuming a Wenzel wetting state. After complete cure (48 hrs), we observed that the initial wetted area decreased, leaving behind a precursor film that suggests autophobic de-wetting. This can be partially explained by the fact that each of the two components that compose the mixture possesses different refractive indices (BADGE = 1.5735; JeffAmine = 1.4466) and, therefore, have distinct substrate adsorption kinetics (determined by the van der Waals interactions). Furthermore, the crosslinking of the polymer mixture decreases the volume and, consequently, the area.