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Scott McLaughlin has picked up where he left off, fastest in practice for this weekend's V8 Supercars meet at Barbagallo Raceway in Perth.

The Volvo man trumped the field in wet and grey conditions ahead of fellow young gun Chaz Mostert in his Ford.

McLaughlin was quickest in each qualifying session and race at the most recent meet on Phillip Island.

The session was delayed for several minutes when Holden man David Reynolds slid off into a sand trap, requiring a helping hand to get back into pit lane.

Further rain is expected on Friday with a forecast of thunderstorms for Saturday unlikely to please team owners keen to keep their cars on the Barbagallo track.