The real-time curing behavior of organic coatings is investigated by bulk acoustic wave (BAW) admittance analysis. During the curing process of the organic coating, multiple processes, such as solvent evaporation, change of the state and mass of coating film, etc., can be described and explained by the change of the parameters of the BAW admittance analysis: f(r) (frequency of zero phase), DeltaL(m) (inductance variation), R-m (resistance) and C-s (stray capacitance). Additionally, the effects of the film thickness and solvents on the curing behavior are also investigated.