An intrepid solo-kayaker is due to leave Coffs Harbour tomorrow morning on an epic paddle to New Zealand.

Scott Donaldson said if he gets the all-clear from weather forecasters he will launch his six metre fibreglass kayak at around 9:00am (AEST).

The 42 year old says part of his trip is to raise awareness about the need to exercise to control asthma.

Mr Donaldson says he has enough food for 70 days and is confident he will reach New Zealand.

"I'm absolutely confident, that with huge respect for the sea, I mean it demands that every time you go out there," he said.

"But you can only do what you can do in your boat, make good decisions and prepare for whatever weather's coming and that's all you can do.

"You use your skills and I'm happy with those but it is the sea so that's always a challenge, doesn't matter what boat you are in."