Coating system, in particular for applying a base coat, a paint, a lacquer or a protective layer to surfaces, in particular of buildings, wind turbines, ships and aircraft, having the following features: a. the coating system has a tank for holding coating liquid before it is discharged, and b. the coating system has an applicator for dispensing the coating liquid, through which applicator coating liquid which is supplied from the tank is output onto a surface which is to be coated, and c. the coating system comprises an unmanned aerial vehicle in the form of a helicopter for outputting the coating liquid, said aerial vehicle having a fuselage and at least two rotors, wherein the tank and the applicator are provided on this aerial vehicle, and d. for supplying the tank on the aerial vehicle with coating liquid, provision is made - for the tank to be permanently fastened to the aerial vehicle and the aerial vehicle or the tank to have a filling opening which is accessible in the fastened state of the tank and by means of which the tank can be refilled in the landed state of the aerial vehicle, and/or - for the tank to be designed as part of an exchangeable tank module which can be coupled to the fuselage of the aerial vehicle and/or can be uncoupled from said fuselage by means of a coupling device which can be controlled in an automated manner, and e. the coating system has a base station which serves as a landing area for the aerial vehicle, and characterized by the features: f. the base station has a mechanically acting positioning mechanism for ensuring positioning of the landed aerial vehicle in a defined service position, and g. the base station and the aerial vehicle have a fixing mechanism by means of which the aerial vehicle can be secured against vertical displacement in the landed state, and/or the base station has a plurality of exchangeable modules which are designed as tank modules, energy supply modules, fuel modules or applicator modules or combinations thereof and which can be moved to a transfer position, from which they can be coupled to the fuselage of the aerial vehicle, by an automated handling mechanism. a. the coating system has a tank for holding coating liquid before it is discharged, and b. the coating system has an applicator for dispensing the coating liquid, through which applicator coating liquid which is supplied from the tank is output onto a surface which is to be coated, and c. the coating system comprises an unmanned aerial vehicle in the form of a helicopter for outputting the coating liquid, said aerial vehicle having a fuselage and at least two rotors, wherein the tank and the applicator are provided on this aerial vehicle, and d. for supplying the tank on the aerial vehicle with coating liquid, provision is made - for the tank to be permanently fastened to the aerial vehicle and the aerial vehicle or the tank to have a filling opening which is accessible in the fastened state of the tank and by means of which the tank can be refilled in the landed state of the aerial vehicle, and/or - for the tank to be designed as part of an exchangeable tank module which can be coupled to the fuselage of the aerial vehicle and/or can be uncoupled from said fuselage by means of a coupling device which can be controlled in an automated manner, and - for the tank to be permanently fastened to the aerial vehicle and the aerial vehicle or the tank to have a filling opening which is accessible in the fastened state of the tank and by means of which the tank can be refilled in the landed state of the aerial vehicle, and/or - for the tank to be designed as part of an exchangeable tank module which can be coupled to the fuselage of the aerial vehicle and/or can be uncoupled from said fuselage by means of a coupling device which can be controlled in an automated manner, and e. the coating system has a base station which serves as a landing area for the aerial vehicle, and characterized by the features: f. the base station has a mechanically acting positioning mechanism for ensuring positioning of the landed aerial vehicle in a defined service position, and g. the base station and the aerial vehicle have a fixing mechanism by means of which the aerial vehicle can be secured against vertical displacement in the landed state, and/or the base station has a plurality of exchangeable modules which are designed as tank modules, energy supply modules, fuel modules or applicator modules or combinations thereof and which can be moved to a transfer position, from which they can be coupled to the fuselage of the aerial vehicle, by an automated handling mechanism.