Method for preparing a cosmetic composition for coating keratin fibres, consisting of the following steps: - in a first phase, heating at least one hard wax having a melting point ranging from 65 to 120°C and optionally at least one additional wax at a temperature above its (their) melting point in order to melt the wax(es), adding at least one emulsifying system capable of dispersing at least the hard wax(es) comprising a non-ionic surfactant with an HLB value at 25°C greater than or equal to 8, preferably greater than or equal to 10, adding water, it being given that the water content used is greater than 25% by weight relative to the total weight of this first phase, preferably the total content of hard wax(es), and optionally of additional wax(es), and the total content of emulsifying system(s) being such that the weight ratio of the hard wax(es) plus additional wax(es)/emulsifying system(s) is inclusively between 2 and 6, more preferentially between 3 and 5, adding the colorants, optionally adding any other compound of thickening nature, such as gums, fillers, pasty fatty substances, or water-soluble film-forming polymers, the order of addition being of no importance, it being understood, however, that it is preferable for the water not to be present at first in order to avoid any early evaporation, emulsifying the whole mixture with stirring at a temperature above the melting point of the wax(es), - in a second phase, placing an aqueous phase comprising an aqueous dispersion of particles of film-forming polymers, or being formed by an aqueous dispersion of particles of film-forming polymers, in a vessel in which the temperature, which is preferably regulated, is inclusively between 0 and 45°C and preferably between 0 and 20°C, the order in which the first phase and the second phase are prepared being of no importance, - bringing the first and second phases together by pouring the first phase, still at a temperature above the melting point of the wax(es), into the vessel containing the second phase having a temperature, which is preferably regulated, between 0 and 45°C and preferably between 0 and 20°C, - leaving to stir until the temperature of the mixture stabilizes at said temperature, which is preferably regulated, between 0 and 45°C and preferably between 0 and 20°C, - preferentially adding a preserving system, preferably once the temperature of the mixture of the first phase with the second phase has stabilised at the temperature, which is preferably regulated, inclusively between 0 and 45°C and preferably between 0 and 20°C. - in a first phase, heating at least one hard wax having a melting point ranging from 65 to 120°C and optionally at least one additional wax at a temperature above its (their) melting point in order to melt the wax(es), adding at least one emulsifying system capable of dispersing at least the hard wax(es) comprising a non-ionic surfactant with an HLB value at 25°C greater than or equal to 8, preferably greater than or equal to 10, adding water, it being given that the water content used is greater than 25% by weight relative to the total weight of this first phase, preferably the total content of hard wax(es), and optionally of additional wax(es), and the total content of emulsifying system(s) being such that the weight ratio of the hard wax(es) plus additional wax(es)/emulsifying system(s) is inclusively between 2 and 6, more preferentially between 3 and 5, adding the colorants, optionally adding any other compound of thickening nature, such as gums, fillers, pasty fatty substances, or water-soluble film-forming polymers, the order of addition being of no importance, it being understood, however, that it is preferable for the water not to be present at first in order to avoid any early evaporation, emulsifying the whole mixture with stirring at a temperature above the melting point of the wax(es), - in a second phase, placing an aqueous phase comprising an aqueous dispersion of particles of film-forming polymers, or being formed by an aqueous dispersion of particles of film-forming polymers, in a vessel in which the temperature, which is preferably regulated, is inclusively between 0 and 45°C and preferably between 0 and 20°C, the order in which the first phase and the second phase are prepared being of no importance, - bringing the first and second phases together by pouring the first phase, still at a temperature above the melting point of the wax(es), into the vessel containing the second phase having a temperature, which is preferably regulated, between 0 and 45°C and preferably between 0 and 20°C, - leaving to stir until the temperature of the mixture stabilizes at said temperature, which is preferably regulated, between 0 and 45°C and preferably between 0 and 20°C, - preferentially adding a preserving system, preferably once the temperature of the mixture of the first phase with the second phase has stabilised at the temperature, which is preferably regulated, inclusively between 0 and 45°C and preferably between 0 and 20°C.