On Wednesday morning, up to 60 cars and houses in the Glencar Park area of Letterkenny had their locks glued by a disguised man who was captured on CCTV.
Local locksmith, Conal Kelly, said the glue renders the doors useless and they cost more than €50 (£40) to replace.
In the first incident on September 28, over 25 homes in Letterkenny were targeted.
Resident John Stevenson had his house and car doors glued shut.
"A neighbour came along and told me I had glue on my front door and the door of my car, all the houses in the row were done.
"He had a little screwdriver with him and he managed to get the glue out of both the house and the car doors so it wasn't a major problem.
"But if I had left the house and pulled the door behind me it would have been a problem there
"It was only then that I had heard that Ballymacool had been targeted before.
"It looked like it was done in a hurry because the glue wasn't right it so it was easy to get out.
"I think it is all a bit silly, the person who did this should grow up."
Gardai (police) Superintendent Vincent O'Brien has appealed to anybody who was in the vicinity of Glencar Park and Circular Road, to contact them.
"Milk delivery agents or people making their way early to work or to early morning gyms may have seen something that could help our investigation.
"We're also appealing to anyone in the Glencar Park area who has CCTV footage, even if they weren't targeted, to come forward and help us."
Gardai are known to be deeply concerned about 'copycats' and the random selection of targets.
Investigations are continuing into the incidents at St Eunan's Terrace. Locally, there has also been reports of similar attacks in the Ard O'Donnell, Convent Road and New Line Road areas.