A strike by motor industry workers will continue until employers come up with a better offer, National Union of Metalworkers of SA (Numsa) president Cedric Gina says.

"Our members cannot accept 6.6 percent [the amount offered by employers]. This is the third day we are on strike and on Monday we will continue striking," he said.

Numsa has demanded a 15 percent wage increase, a 4.3 percent increase in annual bonuses and the outlawing of labour brokers.

Workers marched from Botha's Park to the Durban City Hall on Friday, monitored by police and metro police.

They carried placards that read: "We will strike till Jesus comes" and "We want our money".

Some of them carried knobkerries, sjamboks and sticks. Many wore red Numsa T-shirts.

Gina said the march was a demonstration of workers' were commitment to the strike.

"Yesterday [Thursday] we had a meeting from 3pm until 1am with the employer. We did not reach a conclusion. On Monday we will continue negotiations. The employer must put something on the table," he said.

Gina said workers could continue striking for another week.

"There is nothing Numsa workers can't do," he said, adding that civil servants had been on strike for days and metal workers could do the same.

Petrol attendant Dudu Shezi, who was among the marchers, said she needed a salary increase.

"We face a lot of challenges at work. We work night-shift for a very low wages," she said.

Another petrol attendant, Nelisiwe Zungu, said she would not be paid for the three days she had been on strike. "I really hope the employer reasons with us," she said.

Brigadier Phindile Radebe said the march was peaceful and there were no incidents of violence.

"There were a lot of people, around 5000, but there were no incidents of violence reported," she said.