The kinetics of modification of a fluoropolymer coating (FC 722, 3M Company) during its contact with octane, dodecane, and hexadecane is studied via measurement of quasi-static (velocity independent) advancing and receding dynamic contact angles, A decrease in both angles with the time of contact between solid and liquid is observed and it is interpreted as the result of swelling of the polymer By means of a theoretical extrapolation of the theta(R)(t) data to t = 0, based on an equation relating theta(R)(t) to swelling kinetics, the experimentally inaccessible receding contact angle on dry coating, theta(R)(0), is determined. The contact angle hysteresis on such a surface, theta(A)(0) - theta(R)(0), is found to be less than the hysteresis, theta(A)(infinity) - theta(R)(infinity) obtained on samples that were soaked in the alkanes long enough to reach saturation. This increase is thought to be due to loosening of the polymer chains during the swelling, leading to an exposure of higher-energy segments to the nonpolar Liquid and to an enlargement of the solid surface pores filled with liquid. The contact angle data are also interpreted in terms of interfacial free energies.