MG's Josh Cook leaves his best effort until last to once again lead Motorbase Performance's Mat Jackson following a treacherous final British Touring Car Championship practice session of 2016 at Brands Hatch.
With the rainfall continuing to engulf the Grand Prix layout, conditions failed to improve from the morning's running as the top eight title contenders prepare for what could be the most pivotal qualifying session of the year.
Unlike FP1, three red flags hit the running but it didn't stop Triple Eight Racing's Cook from completing his practice domination.
As the chequered flag fell, Jackson looked set to share the practice honours with Cook as the Ford driver headed the timesheets with a 1 minute 44.057 second effort.
But Cook displaced Jackson at the last possible moment after trumping the Motorbase driver's time by almost 0.3s.
Speedworks Motorsport's Tom Ingram followed up just 0.026s back from Jackson to complete the top three ahead of Honda's Gordon Shedden in fourth.
Aron Smith was fifth for the Team BKR Volkswagen CC outfit, just 0.013s better off than MG's Ashley Sutton in sixth.
Andrew Jordan, Adam Morgan, Colin Turkington and Michael Epps completed the remainder of the top-ten, all lapping within 0.8s of Cook's front running effort.
Championship leader Sam Tordoff once again featured outside of the top-ten in 14th, two places behind Honda's Matt Neal but eleven spots ahead of his WSR team mate Rob Collard.