In April, Mr Seal tested his urban winemaking proposal by creating a pop-up urban winery in the former Gresham Hotel site.
He brought grapes down from Central Otago and made Central Otago pinot noir ''right in the middle'' of the city.
It was a fun initiative, gaining the attention of both the public and the media.
From there, having proved the idea ''had some traction'', he decided on his next step.
He chose crowdfunding, although it was ''really only a baby step'', he said.
By offering some rewards in advance, Mr Seal hoped to raise enough money to purchase pinot noir grapes and oak barrels in time for the 2017 harvest.
Then he would again provide the winemaking equipment, experience and labour and make Central Otago wines in the city again.
He needed to raise $18,400 to buy four tonnes of grapes and $4600 for the oak barrels to mature the wine.
He has already hit the $20,000 target on crowdfunding platform PledgeMe and, if he got additional funding, then it would help him to lease premises for a permanent winery location.
Initially, he thought that might happen in 2018 but it could be as soon as next year, he said.
While there had been a lot of hard work involved, the interest from people had been ''fantastic''.
Mr Seal said he was grateful for the support in the city, which ranged from the Dunedin City Council to the Otago Chamber of Commerce.