A process and a device for coating a temperature-stable component with a thermal protection layer (15), in which the temperature-stable component has a surface (12) which is to be coated with the thermal protection layer (15) and at which there is at least one cooling-passage opening (1) which is connected to a cooling passage running inside the component. During the coating a mass flow (10) emerges through the cooling-passage opening (1), the coating takes place by a coating mass flow (11) directed onto the surface (12) which is to be coated, and the mass flow (10) emerges through the cooling-passage opening (1) and the coating mass flow (11) include an angle &agr;≠0°.