Andre Heimgartner set the Practice 2 pace at The Bend Motorsport Park in a session punctuated by several offs and spins.
Kelly Grove Racing had its two cars in the top four, with David Reynolds recovering from a rotten first practice outing to slot in behind Heimgartner, Red Bull Ampol Racing’s Jamie Whincup and Shell V-Power Racing Team’s Will Davison.
Click here for Practice 2 results
Winterbottom pips SVG in action-packed first practice
Davison, with his initial 1:50.204s, loomed to top the 30-minute hitout once drizzle descended on the Tailem Bend venue.
However, the times began to fall, with Heimgartner pipping Whincup at the death with a 1:49.241s session-best.
The 10 drivers all dipped under the 1min50s bracket, with the top 15 covered by less than a second.
WATCH: PRACTICE 2 HIGHLIGHTS
Several drivers were caught out by the greasy conditions, with James Courtney, who spun off in Practice 1, sliding onto the grass in the dying moments.
All three Tickford Racing entries hit trouble, with Jack Le Brocq finding the gravel, while Cameron Waters straightlined the grass.
WATCH: COURTNEY’S WILD SLIDE
Courtney, Reynolds and Todd Hazelwood all spent time at the top as quick times filed in.
Whincup, who won the second race of the Tasmania weekend last time out, shot to the top with a 1:49.404s.
WATCH: WATERS CAUGHT OUT IN PRACTICE
However, he was displaced by Heimgartner, whose 1:49.241s proved the best of the session.
Chaz Mostert, who won the Symmons Plains finale last month, was fifth, albeit 0.416s adrift.
Courtney ended up sixth despite his late-session spin, ahead of Hazelwood, championship leader Shane van Gisbergen and Brodie Kostecki, with Bryce Fullwood rounding out the top 10.
WATCH: DRIVERS BATTLE IN THE WET
The Repco Supercars Championship field will return for Race 9 qualifying at 1:20pm AEST. Check out the full weekend schedule here.
The OTR SuperSprint will be broadcast live on Foxtel and will be streamed on Kayo with highlights on 7 and 7 Plus.