Byrnes too hot to handle for Harps
St Patrick's Athletic 4 Finn Harps 0
Graham Kelly, Kurtis Byrne, with a brace, and Conan Byrne provided the goals as St Pat's equalled their biggest win of the season.
The victory, their fourth in five games, moves Liam Buckley's side three points clear of the relegation zone as defeat see Finn Harps drop into the bottom three.
After a shaky opening, St Pat's took the lead on 23 minutes Josh O'Hanlon and Paul O'Conor worked the opening for Kelly who showed terrific skill and composure to cut past a defender before drilling a low drive to the far corner of the net.
St Pat's began the second half on the front foot and were close to extending their lead a minute in.
O'Conor threaded a delightful ball through for the run of O'Hanlon. The striker slipped the ball past the advancing Gallagher, but defender Kilian Cantwell did well to hack the ball off the line.
Though St Pat's continued to dominate, Harps were a threat on the counter and might have levelled on 59 minutes.
Sean Houston did well on the right to cross for Eddie Dsane who planted his diving header wide when he should have at least hit the target.
But St Pat's extended their lead on 83 minutes. Billy Dennehy got free on the left to whip over a cross which was met by sub Kurtis Byrne who crashed the ball past Gallagher. Harps then finished with ten men when Dsane was shown a straight red card, apparently for dissent.
And St Pat's had the final say with Byrnes, Conan and Kurtis, combining for the former to tap home their third goal in the first minute of added time.
Kurtis was there again three minutes later to rifle his second of the game to the roof of the net to complete the rout.