A process for preparing an article having anti-fog properties, comprising: a) providing a substrate having at least one main surface coated with an intermediate coating obtained by applying and at least partially curing an intermediate coating composition comprising at least one monoepoxysilane and/or an hydrolyzate thereof and at least one polyepoxy monomer comprising at least two epoxy groups, b) forming onto said intermediate coating at least one bi-layer obtained by: b1- forming a first layer by applying a first layer composition on said intermediate coating, said first layer composition comprising at least one compound A having a first electric charge, b2- forming a second layer by applying a second layer composition directly on said first layer, said second layer composition comprising at least one compound B having a second electric charge which is opposite to said first electric charge, compounds A and B being independently chosen from polyelectrolytes, SiO 2 nanoparticles comprising ionic groups and TiO 2 nanoparticles comprising ionic groups, with the proviso that at least one of said first and said second layer comprises SiO 2 nanoparticles comprising ionic groups and/or TiO 2 nanoparticles comprising ionic groups, preferably SiO 2 nanoparticles comprising ionic groups, c) curing said at least one bi-layer by heating at a temperature of 150°C or less, preferably 140°C or less, more preferably 130°C or less, even better 120°C or less, at atmospheric pressure and in the absence of added water steam. a) providing a substrate having at least one main surface coated with an intermediate coating obtained by applying and at least partially curing an intermediate coating composition comprising at least one monoepoxysilane and/or an hydrolyzate thereof and at least one polyepoxy monomer comprising at least two epoxy groups, b) forming onto said intermediate coating at least one bi-layer obtained by: b1- forming a first layer by applying a first layer composition on said intermediate coating, said first layer composition comprising at least one compound A having a first electric charge, b2- forming a second layer by applying a second layer composition directly on said first layer, said second layer composition comprising at least one compound B having a second electric charge which is opposite to said first electric charge, compounds A and B being independently chosen from polyelectrolytes, SiO 2 nanoparticles comprising ionic groups and TiO 2 nanoparticles comprising ionic groups, with the proviso that at least one of said first and said second layer comprises SiO 2 nanoparticles comprising ionic groups and/or TiO 2 nanoparticles comprising ionic groups, preferably SiO 2 nanoparticles comprising ionic groups, b1- forming a first layer by applying a first layer composition on said intermediate coating, said first layer composition comprising at least one compound A having a first electric charge, b2- forming a second layer by applying a second layer composition directly on said first layer, said second layer composition comprising at least one compound B having a second electric charge which is opposite to said first electric charge, compounds A and B being independently chosen from polyelectrolytes, SiO 2 nanoparticles comprising ionic groups and TiO 2 nanoparticles comprising ionic groups, with the proviso that at least one of said first and said second layer comprises SiO 2 nanoparticles comprising ionic groups and/or TiO 2 nanoparticles comprising ionic groups, preferably SiO 2 nanoparticles comprising ionic groups, c) curing said at least one bi-layer by heating at a temperature of 150°C or less, preferably 140°C or less, more preferably 130°C or less, even better 120°C or less, at atmospheric pressure and in the absence of added water steam.