Abstract: A process and an apparatus for coating glass substrate by using at least one or more liquid raw materials which react essentially on or in the vicinity of at least a portion of the glass substrate surface. The process comprises steps: a) heating the glass substrate to at least substantially the coating temperature; b) forming a coating on the glass substrate surface by converting the one or more liquid materials to a liquid-aerosol and depositing at least a fraction of the liquid-aerosol on the glass substrate surface; c) repeating step b) at least once; and d) heating the glass substrate surface before at least one of the steps b). The heating in step d) is carried out by convective heating.