An applicator for applying a material over a fastener head, protruding from a non-horizontal surface of a part, comprises an enclosure and a daubing lever. The daubing lever passes through the wall of the enclosure and is movably coupled to the enclosure. The daubing lever comprises an actuation end, located on the outer side of the wall of the enclosure, a working end, located opposite the actuation end on the inner side of the wall of the enclosure, and an abutment portion, located at one of the actuation end, the working end, or between the actuation end and the working end. The applicator further comprises a biaser for imparting a moment on the daubing lever to bias the abutment portion of the daubing lever toward the enclosure.