Adhesion and impact properties of a silane-zeolite composite coating on aluminum substrates have been investigated. The composite film was prepared with different silane matrix formulations (changing bifunctional and trifunctional silane ratios). The results showed high hydrophobicity of the modified silane-zeolite coating and good adhesion performances for the sample with a lower bifunctional silane amount. Furthermore, the composite coating with a mixed formulation of the silane matrix evidenced good impact properties, with better results for the sample despite the unmodified silane coating with a higher amount of bifunctional silane.