The present invention relates to an aerosol device comprising a composition for dyeing keratin fibres, comprising at least one aqueous dispersion of particles of hybrid, film-forming, hydrophobic acrylic polymer, at least one silicone compound chosen from linear silicone block copolymers and amino silicones, and at least one pigment. The invention also relates to a dyeing process in which said composition is applied to keratin fibres, the operation optionally being followed by drying. The composition makes it possible to obtain a coloured coating, which is persistent with respect to shampooing operations, leaving the treated fibres individualized, with an improved cosmetic feel.