The aim of the present invention is to provide a fluid composition that can form a coating, said composition being characterized in that it contains, at least in a solvent medium, an effective amount of at least one natural virucide selected from among lauric acid, monolaurin, lactoferrin and essential oils having antiviral activity and/or one of the precursors thereof, said composition having a viscosity of 30 mPa·s to 40 Pa·s at room temperature and pressure.