The present invention relates to aqueous two-component adhesion promoter compositions and also to their use in methods of adhesive bonding or sealing. Additionally it relates to packaging consisting of the two-component composition and also a pack having two chambers. The two-component adhesion promoter composition is composed of a first component K1 comprising at least one organoalkoxysilane S and at least one anhydrous surfactant T; and of a second component K2 comprising at least water and at least one acid, the acid being present in an amount such that, after components K1 and K2 have been mixed, the resulting mixture is acidic.