The invention relates to a cosmetic product, comprising a) a cosmetic preparation, containing, in relation to its total weight, a1) about 45 to about 98 wt. % of at least one polar solvent; a2) about 0.5 to about 15 wt. % of at least one copolymer from the monomers i) n-tert-octylacrylamide, ii) acrylic acid, iii) tert-butylamino ethyl methacrylate, iv) and optionally other monomers; b) a device for flash evaporation of the cosmetic preparation a), and to a method using corresponding products and to the use of the cosmetic preparation a) as process material in a device for flash evaporation.