Welcome to our LIVE commentary from this final practice session ahead of qualifying for the Brazilian Grand Prix at Interlagos.

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That's it, all over, with Kubica finishing at the top of the timesheet, followed by Vettel, Hamilton, Massa and Alonso. Button finished ninth fastest, Webber 11th and Michael Schumacher 12th. Webber is the big surprise - but then again he only drove six early laps, so don't read too much into it.

The few drivers left out there are trying some practice starts in these difficult conditions.

Jenson Button's pit radio conversation reveals that he is having trouble with locking his brakes and the car trying to oversteer on him.

As the clock ticks down there are 10 or so drivers who will complete a flying lap before the end of this session.

Robert Kubica has just nailed a lap in the Renault on intermediates, with a 1:19.191 that blows Vettel's time out of the water.

Button comes out again, but is still miles off the pace - either he's trying something wacky with the set up or he is just not comfortable int he conditions at the moment.

Great lap from Hamilton - it's a 1:19.536, just a few hundredths off Vettel's time, and the Stevenage native would have been even quicker if he hadn't locked up his front wheels a little in the middle section.

Hamilton is on a flyer here trying to post a quickest time for a confidence boost going into qualifying later.

Lewis Hamilton runs wide onto a patch of astroturf on the exit to turn two - that looks the slipperiest bit of the track still.

Toro Rosso's Sebastien Buemi is back out on the track now and pushing for a quick one, whille Lewis Hamilton is back out.

Still just Vettel, Massa, Alonso and Hamilton who are under the 1:20 mark, with Webber only the ninth fastest man in the session so far.

Kubica loses it on the second sector of that solid-looking lap and comes back in.

The rain has dried up now - we might just see a few laps on slicks before the end of the session.

Robert Kubica is out on the track now and has just set the fastest first sector.

Bruno Senna comes onto the radio to complain about the greasiness, but gets told to come back into the garage to try the slicks!

Button is unable to improve his time with another lap and comes back in. Time for a bit of rapid pre-qualifying thinking.

Bruno Senna has just got away with one on the exit to turn two, sliding across the slippery track but getting back in shape with some good wrestling of the steering wheel.

Reiging F1 champ Button comes around for another lap and shaves three quarters of a second off his previous lap, enough to lift him to seventh in the list.

Button impoves a little with his next flying lap, but is still 1.156 off Vettel's pace.