When the Walkinshaw Andretti United crew released Mostert from the pitlane after changing tires, he drove into the trail of Tickford's Thomas Randle, forcing him to hit the brakes.
The resulting five-second penalty saw Mostert attempting to construct a lead over fellow Ford Mustang driver Waters, but a lead of just 2.58 seconds gave Waters his first victory of the season.
Waters took pole position by just 0.03 seconds, but a slip at the top of the primary lap left Waters running wide and Mostert into the lead, which he would hold until the penalty was decided.
“It's great to get some trophies this weekend and get a race win,” Waters said. “I put my head down and closed the gap to Chazzie. Just two or three years ago I lost a race with a five-second penalty, so it was good to get it back!”
Mostert raised his hand to take the blame for losing the race.
“It sucks. I didn't expect that we could be so near anyone else,” he said. “I used to be a bit of hesitant, it was my mistake, I'll take this one.
“I didn't really race the race I wanted to. I probably burned some tires trying to achieve this [back] this punishment. He [Waters] He calmed down and ran a smart race.”
Triple 8's Will Brown secured third place on the course, replacing Randle on lap 49 of the 55-lap race. In doing so, he helped Randle off the road and earned a five-second time penalty himself, which he exceeded by just over one second, maintaining his second podium position of the weekend.
“I was working hard to get to him, I thought he moved under the brakes. “Unfortunate for him,” he said. “For us, third and second place after a hard weekend is a good weekend.”
Randle dropped back to fifth, splitting the Dick Johnson Racing Ford duo of Will Davison and Anton de Pasquale, who finished sixth.
It was a tricky Sunday for Triple 8's Broc Feeney, who qualified outside the highest ten and will only advance to seventh. WAU's Ryan Wood was eighth, ahead of fellow Ford driver Matt Payne (Grove Racing) and David Reynolds (Team18 Chevrolet).
The results mean Brown has prolonged his points lead over teammate Feeney to 136 points.
The 2024 Supercars season will resume in 4 weeks when teams gather for round five of the championship at Hidden Valley in Darwin on June 15-16.
