"It's something that will encourage someone to come forward and help identify who's causing the problem."
"We want a community that looks after each other and this is about driving that home."
He said the red spray paint scrawls left at the weekend would cost the public hundreds of dollars to clean up and that was another cost no-one needed.
Several people came forward with information he had passed on to the Oamaru police, the mayor said.
"We spend a lot of ratepayers' money making sure the district looks nice and it costs a lot - and this [tagging] costs a lot."
He said the North Otago town did not want to tolerate vandalism.
"People have a right to be angry about this. It's damaging their property."