"I knew it was going to be a challenge when I was first appointed chief executive to turn Infracon around and it's just disappointing we didn't get the opportunity because we were building momentum," he said.
"Everyone knew the company needed a cash injection for restructuring and capital expenditure and I'm bitterly disappointed with the way things turned out as the whole Infracon workforce got behind it.
"It's a real shame because in six months' time we would have been seeing greenshoots as we became a smaller, more focused company.
"We would have turned around in two years."
At the time of Mr Mason's appointment, Tararua District Council's Deputy Mayor Bill Keltie said he was impressed with the attitude of Infracon's new chief executive and his drive for profitability for the company and his wish to "do it right, do it once".
Mr Mason said it had been upsetting as the business broke up.
"We've been very much like a family and it's been hard," he said. "People have put their heart and soul in the company and schools and other organisations have benefited from Infracon and they'll miss out now."