A cosmetic product comprising a) a cosmetic preparation containing, based on the total weight thereof, a1) 45 to 98 wt.% of at least one polar solvent; a2) 0.1 to 4.0 wt.% chitosan; a3) 0.1 to 15 wt.% film-forming polymer; b) a device for flash evaporation of the cosmetic preparation, comprising b1) a container defining a closed interior in which the cosmetic preparation can be received, b2) a valve or a similarly functioning closure element for closing and opening the interior of the container that is at least partially filled with the cosmetic preparation, b3) a heating device for heating the cosmetic preparation located in the closed interior of the container under increased pressure, and for releasing, under reduced pressure, the heated cosmetic preparation from the interior of the container into the surroundings, b4) a nozzle which allows atomization of the cosmetic preparation escaping from the container, c) a reservoir for the cosmetic preparation, from which the cosmetic preparation can enter the container, wherein - the access between the reservoir and the container has a component for controlling flow, by means of which the flow of the cosmetic preparation from the reservoir into the container can be interrupted, - the reservoir has a volume which is at least ten times, preferably at least twenty times and in particular at least fifty times the volume of the container, - the pressure inside the reservoir corresponds to the ambient pressure. a) a cosmetic preparation containing, based on the total weight thereof, a1) 45 to 98 wt.% of at least one polar solvent; a2) 0.1 to 4.0 wt.% chitosan; a3) 0.1 to 15 wt.% film-forming polymer; a1) 45 to 98 wt.% of at least one polar solvent; a2) 0.1 to 4.0 wt.% chitosan; a3) 0.1 to 15 wt.% film-forming polymer; b) a device for flash evaporation of the cosmetic preparation, comprising b1) a container defining a closed interior in which the cosmetic preparation can be received, b2) a valve or a similarly functioning closure element for closing and opening the interior of the container that is at least partially filled with the cosmetic preparation, b3) a heating device for heating the cosmetic preparation located in the closed interior of the container under increased pressure, and for releasing, under reduced pressure, the heated cosmetic preparation from the interior of the container into the surroundings, b4) a nozzle which allows atomization of the cosmetic preparation escaping from the container, b1) a container defining a closed interior in which the cosmetic preparation can be received, b2) a valve or a similarly functioning closure element for closing and opening the interior of the container that is at least partially filled with the cosmetic preparation, b3) a heating device for heating the cosmetic preparation located in the closed interior of the container under increased pressure, and for releasing, under reduced pressure, the heated cosmetic preparation from the interior of the container into the surroundings, b4) a nozzle which allows atomization of the cosmetic preparation escaping from the container, c) a reservoir for the cosmetic preparation, from which the cosmetic preparation can enter the container, wherein - the access between the reservoir and the container has a component for controlling flow, by means of which the flow of the cosmetic preparation from the reservoir into the container can be interrupted, - the reservoir has a volume which is at least ten times, preferably at least twenty times and in particular at least fifty times the volume of the container, - the pressure inside the reservoir corresponds to the ambient pressure. - the access between the reservoir and the container has a component for controlling flow, by means of which the flow of the cosmetic preparation from the reservoir into the container can be interrupted, - the reservoir has a volume which is at least ten times, preferably at least twenty times and in particular at least fifty times the volume of the container, - the pressure inside the reservoir corresponds to the ambient pressure.