Auckland ambulance staff have defaced their own vehicles in protest at their working conditions.
Around 1000 St John staff went on strike in November, saying they wanted a pay rate that recognised their unsociable hours and the physical toll of their jobs.
With no progress in the pay talks, ambulance staff have taken to scrawling messages on their ambulances to drum up public support.
One St John paramedic, who wanted to remain anonymous out of fear of retaliation from his employer, said nearly every ambulance driven by a First Union member had been defaced. They were using liquid chalk so the vehicles were not permanently marked.
"It's up to each individual officer what to write, but they all know not to write anything derogative," he said.