Just a week after Jackie McNamara's side were held to a surprise 1-1 draw by the minnows, the Jags ran out comfortable winners to book a place in the fourth round of the Scottish Cup.
The Thistle squad were the target of heavy criticism by disgruntled fans after a below-par showing in Peterculter nine days ago, but showed their class to emerge victorious at Firhill, with Erskine joined on the scoresheet by Christie Elliot and Paul Cairney.
Thistle could have added several more goals to their tally but Erskine was pleased to finally kill off Culter's cup dreams and book the Jags' place in the next round.
He said: "We were embarrassed and disappointed after the first game but the main thing on Saturday was just to get through to the next round. It was definitely a lot better than last week.
"The criticism was well- deserved I think. It was a hard game for us up there, it was Culter's cup final.
"They made it difficult for us but that wasn't an excuse for the way we played. The boys were determined to make up for it on Saturday and I think we did that.
"We scored four good goals and it could have been a lot more than that. We had chance after chance but the main thing was getting through to the next round so we are happy."
Thistle never looked in any danger of being the victims of another cup shock as they dominated from start to finish.
Elliot fired them ahead after just 11 seconds before Cairney made sure of the result with a quickfire double. Erskine then netted just after the restart to add a shine to the scoreline and admits they could, and should, have notched more goals on a comfortable afternoon.
Erskine said: "It is always nice to get a goal. It was a great ball from Paul Paton and I saw the keeper off his line.
"It was a decent finish but I was disappointed not to score another couple. I had one when I was right through on goal and I slipped. That was frustrating but it is another one to my tally for the season, which is pleasing.
"Cairney was trying his hardest to get his hat-trick, he is a bit gutted that he never got it. He could have had two hat-tricks on another day. He took his goals well and was unlucky with his free-kick that hit the bar."
Having seen off Culter at the second attempt, Thistle will now host Irn-Bru First Division rivals Queen of the South in the next round, with a place in the last 16 up for grabs.
The draw means Thistle will square up to Gus MacPherson's side twice in three weeks, with the Doonhamers making the trip to Glasgow on Boxing Day on league duty before the cup clash on January 7.
Erskine is targeting another triumph as the Jags attempt to atone for early exits from the Scottish Communities League Cup and Ramsdens Cup already this season.
He said: "Sometimes you don't like getting someone from your own league in the cups because you play them so often during the league season.
"On the other hand, we know what they are like and what their strengths and weaknesses are. It is a home tie for us and a chance for us to get to the next round hopefully."