The disclosure relates to a cosmetic product, comprising a) a cosmetic preparation, containing, in relation to its total weight, a1) 45 to 98 wt.-% of at least one polar solvent； a2) 0.1 to 4.0 wt.-% of chitosan； and a3) 0.1 to 15 wt.-% of a film-forming polymer； b) a device for flash evaporation of the cosmetic preparation a), and to a method using corresponding products and the use of the cosmetic preparation a) as process material in a device for flash evaporation.
