A method of treating keratinous substrates, includes actuating a packaged makeup priming product that includes a mousse-forming composition to release a makeup priming composition. The method further includes applying the makeup priming composition to the keratinous substrate to form a primed keratinous substrate; and applying a makeup topcoat composition comprising colorant over the primed keratinous substrate. The mousse-forming composition comprises propellant gas; water; and a water-soluble or water-dispersible polymer. The mousse-forming composition has a Surface Tension Value of less than about 63 mN/m and is substantially free of surfactant. Kits are also provided.