Disclosed is a cosmetic product comprising a) a cosmetic preparation that has a viscosity of 5,000 to 1,000,000 mPas and contains, in relation to the total weight of the preparation, a1) 60 to 98 wt % of at least one polar solvent; a2) 0.01 to 10 wt % of at least one thickener; b) a device for flash evaporating cosmetic preparation a). Also disclosed are a method using corresponding products and the use of cosmetic preparation a) as a process material in a flash evaporation device.