Their opponents lodged a protest against them, but siblings Priscilia and Cecilia Low knew they had clinched gold for Singapore in the women's 470 class last Friday.
On the last day of the six-day sailing regatta at the Ngwe Saung Beach in Myanmar, the Republic bagged another two golds through the Low sisters and Fathin Rasyiqin in the girls' Optimist class.
Priscilia, 24, and Cecilia, 22 had to wait two hours for confirmation on their victory after a protest was lodged by Myanmar and Thailand, who finished third and fourth respectively.
Malaysia bagged the event's silver medal.
"There was an incident during the race, while we were rounding one of the markers," Priscilia explained.
"The Myanmar and Thai teams came close to us, but we managed to avoid them... We weren't really worried about it. In the end, the protest was thrown out very quickly.
"It was a pretty intense finish; it went down to the last race and we're just so glad to have won."
Last Friday's two victories took the final sailing haul to five gold, two silver and five bronze medals, making Singapore the top sailing nation at the South-east Asia (SEA) Games.
The Republic had already secured three golds on Thursday through Elizabeth Yin (women's Laser Radial), Edward Tan (boys' Optimist) and the duo of Kimberly Lim and Savannah Siew in the women's 420.
"We're all super pleased with our total haul. It really makes us proud to be Singaporean," said Priscilia, whose best performance before last Friday was a silver in the 420 at the 2006 Asian Sailing Championship.