A fluid application device for mechanical fasteners such as rivets, screws, bolts, and similar fasteners, and a robot end effector including such a device as well as a robot being equipped therewith. The fluid application device includes a fluid application element having a curved application surface, wherein the curved application surface includes a channel configured to receive a fluid. A brush is arranged at the curved application surface such that the fluid is able to wet the brush elements. The device further includes a gripping device configured to push a mechanical fastener against the wetted brush elements.