wHydrophobic films of seven different polymers are rendered hydrophilic by immersion into a wetting colloid; for example, the tin sol and the iron sol. Once adsorbed, the hydrosol coating has excellent adherence to the polymer surface; moreover, its presence produces a permanent modification to the water wettability. The aspects of interfacial thermodynamics and electrokinetics were investigated. The rates of the interfacial adsorption of wetting colloids on polymers were found to depend on surface properties. At pH values greater than the isoelectric points of 4.0 and 7.0 for respective tin colloids and iron colloids, none of the negatively charged colloids adsorbed on the polymer surfaces, and the substrate surfaces remained as hydrophobic. At pH values less than the isoelectric point of colloidal particles, the positively charged tin colloids adsorbed on the polymer surfaces over the pH range from 1.0 to 3.0, and so were the iron colloids adsorbing from pH 1.0 to 6.0. The hydrophilicity and water wettability of polymer, surfaces increased with the incremental immersion time. The thermodynamic predictions were found to be consistent with the observed wettability data for the tin colloids, in which adsorption increased with increasing surface energies of the polymers. It is pointed out why the electrostatic stability of colloidal particles due to a large zeta potential can influence the wetting rates of the iron colloids to the polymer surface.