Applicator (11) for application of a viscous mass (31) to a surface (33) comprising a heated chamber (32) in communication with openings (12) controlled by valves (14) allowing dropwise discharge of the viscous mass to the surface. The valves (14) are non-packed and comprise an outer sleeve (15) having at least one through opening (16) in its sleeve wall and valve plug (17) adapted to the internal surface of the sleeve (15). The valve plug (17) is reciprocated by a valve lifter (18) from a closed position completely sealing the at least one through opening (16) in the sleeve wall, to an elevated open position exposing at least the lowermost part of the at least one through opening (16) allowing viscous mass (31) to pass from the outside of the sleeve (15) to the inside thereof.