In paint application devices that work on the pouring principle, it is known to collect the liquid flowing over a spillover weir in an upstream liquid reservoir. The liquid then flows over the spillover weir and over the guide surface extending downstream therefrom. When large application quantities of 50 l/m/min and more are involved, there is a risk that the liquid film may become separated from the guide surface in the area of the spillover weir. It is intended to coat this spillover weir over the entire working width thereof by using a height-adjustable diverter block with a downwardly protruding lip to regulate the volume of liquid that flows down onto the guide surface.