Upper radiator hose connection

[Rederic]

Upper radiator hose connection-good day all!
Recently had the radiator off and cleaned…
Looks like when the mechanic put it back on they used some black sealant on the upper radiator hose fitting (between the engine and the fitting).. it’s leaking coolant from the spot.
Does anybody know if it’s normally an O-ring or something else that goes between this fitting in the motor?
Should Pirma Tex like sealant work for this fitting?
Or is this a no-go?