Self-enhancement (SE) of a dynamic hologram is the increase in its diffraction efficiency (DE) over time under the stimulus of a single beam light irradiation or simply in the dark [1]. Three types of SE can be distinguished: (i) coherent SE (CSE) due to the holographic recording by diffracted waves; (ii) incoherent SE due to the contrast and/or transmission increase of a hologram by incoherent light; (iii) relaxational (or dark) SE due to the contrast and/or transmission increase of a hologram by thermostimulated relaxation processes. All three SE types can take place simultaneously [1]. In this paper we have experimentally studied the CSE polarization dependence of dynamic transmission holographic gratings (HG) recorded in molecular glassy films W-75. A strong effect of recording and enhancing light polarizations on CSE is found. The highest CSE factor (showing the DE increase with respect to the initial DE ) of 14.5 was achieved in the case or recording and enhancing the grating by circular L-polarizations.