A process for preparing a coated plasterboard, comprising the following steps in the following order in one production cycle: a) forming a plasterboard; b) drying the plasterboard in a drying device; c) coating the plasterboard by spraying with a coating agent after said drying; d) stacking the plasterboards;wherein there is a period of time of less than 60 seconds between the end of the coating and the stacking of the plasterboards.