Supercars drivers will be forced to qualify for the Bathurst 1000 in the dark over their car setups after rain returned to Mount Panorama.
Co-drivers enjoyed the chance to take their cars for a spin on a dry track earlier on Friday, when reigning champion Luke Youlden went fastest.
Yet the main-game drivers haven't enjoyed the same luxury.
Friday's final practice session was washed away, with several cars - including Jamie Whincup and other Commodores - choosing to stay in pit lane.
Nissans took out the top two spots, with Michael Caruso and Rick Kelly quickest.