AbstractCuring of wood‐polyester combitions was studied by recording dielectric spectra as a function of temperature at fixed frequency at different stages of cure and as function of cure‐time at fixed temperature. The measurements were preformed by a specially constructed continuously recording spectrometer equipped with linear temperature program. By measuring the shifts of the dielectric transition temperatures it was possible to follow changes of the molecular mobilities in the resin as crosslinking proceeded. By measuring the relative intensities of the dielectric absorption the change of the concentration of the polar groups as a function of cure time could be followed. The existence of a stepwise aftercuring waw revea