Jim Goodwin's side found themselves a goal down early when the Honest Men's Tomi Adeloye capitalised on a defensive mix-up. St Mirren recovered well and levelled before the break through youngster Jay Henderson's clinical close-range finish.
The Buddies made eleven changes before the hour mark, and substitute Erwin made it two goals in his last two outings with a fine finish just two minutes after entering the fray.And fellow sub Kristian Dennis made sure of the result on the 72 minute mark when he calmly fired home from the penalty.
The Paisley side's next outing sees them travel to Dumbarton for the first game of their Premier Sports Cup group stage, which marks their first competitive outing of the 2021/22 season..
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