MG's Josh Cook has emerged from a greasy opening British Touring Car Championship practice fastest of all as a series of on-off of light rain showers jumble the early order at Brands Hatch.
The Triple Eight Racing driver bolted to the top of the timesheets late in the 40-minute session as the conditions gradually improved enough for the slick tyre to make a last minute appearance.
Motorbase Peformance's Mat Jackson followed the leading MG6 GT runner in second, 0.4s shy of Cook's 1 minute 40.042 second effort.
Jackson proved the quickest of the eight title contenders by quite some margin ahead of West Surrey Racing's Rob Collard in ninth.
While the majority of the front runners opted not to set a hot lap in the drying conditions, Handy Motorsport's Rob Austin filled the void with the third fastest time ahead of Ollie Jackson's Audi S3 in fourth.
Speedworks Motorsport's Tom Ingram led a three-car Toyota Avenis lock-out in fifth ahead of Michael Epps and Jake Hill in sixth and seventh.
WIX Racing's Adam Morgan was eighth in the lead Mercedes A-Class effort while Collard and Eurotech's Jeff Smith completed the remainder of the top-ten order.
Championship leader Sam Tordoff was twelfth, directly ahead of Honda's Matt Neal in 14th position.