And that concludes the session. Lewis Hamilton fastest with Jenson Button completing a one-two for McLaren.
Free Practice 2
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Button very slow on his first lap on the dry rubber... and he tells the team he cannot get any heat into them.
Hamilton has soft rubber on his car for one last run.
Button wants supersoft tyres but Hamilton tells McLaren it is too wet for dry tyres.
Alguersuari out on supersoft tyres - perhaps he just wanted one run on these and there isn't a problem.
Senna spins again in his Renault - on intermediate tyres.
Alguersuari came back out but only lasted one lap. Looks like he has another issue.
There is sttill some water on parts of the circuit, especially the final corner - therefore many teams still using inters and not risking their chassis with a run on slicks.
He still leads the way, however, from Button and Vettel. The latter is back in the pits.
Hamilton off into the turn four grass and back on track.
Toro Rosso mechanics are working to mend Alguersuari's car in a bid to get it ready for another run.
The pieces of Rosberg's car have now been removed and the rest of the field can crank it back up.
Rosberg locks in turn one and slides into Alguersuari's Toro Rosso! It's a nasty bump and there's debris on the track.
Vettel's Red Bull isn't really threatening the McLarens at the moment. But a drying racing line might change that.
Half an hour remaining...
Alonso now climbs into third place after a 1m52.774s...
Alguersuari, who paced the opening stages of the session, is in sixth.
Alonso nearly joins the big boys with a lap of 1m53.158s - the Ferrari man settles for fifth.
Hamilton returns to the track and nearly tops his own benchmark time of 1m50.828s with a quick final sector.
Ferrari on their Twitter feed: "Fernando is coming in: once more, nose change and then out again."
So, Hamilton, Button, Vettel and Webber are the top four with a quarter of an hour remaining in this session.
Hamilton heads back into the pit lane after asking his team where he was losing time. "That last lap, you were down 0.2secs in sector two but given where we are on fuel and tyres I think that's a very good lap time," is the reply from his engineer.
Button tells his team that he can't see a dry line for the moment but there can be no denying that the track is drying out.
Webber shunts Alguersuari back out of the top four with a lap of 1m53.251s.
Button looks good but he can't topple Hamilton and he crosses the line 0.104s back on his McLaren team-mate.
Alguersuari breaks up the McLaren-Red Bull top four with a time of 1m53.438s that puts him fourth.
Hamilton, Vettel and Alonso all head back to their respective garages. And the rain has not stopped. It's still coming down.
Hamilton has improved once again to 1m50.828s and he now tops the timesheets by half a second.
It looks like the rain has stopped and the wet track should soon be downgraded to a damp one.
Hamilton now leads the timesheets, with Button in second, Vettel in third and Webber in fourth. That top four's got a familiar ring to it, hasn't it?
Just Massa and Schumacher are yet to register a time now.
Despite heading the pack, Button says on his team radio:"Really struggling with heat at the front - really struggling with heat in the front tyres."
Button is currently top of the lists, followed by Vettel and then Hamilton, who posts a sprightly 1m54.022s. Every driver is on track now.
Buemi reclaims top spot again as Alsono reports rainfall to his garage. Schumacher is coming out shortly.
Button soon goes fastest but he is deposed quickly enough by Vettel. It's all happening out there at the moment.
Alonso joins the party in fourth before Buemi takes top spot from Vettel with a 1m55.305s.
Here come the Red Bulls... and the pair go straight to the top of the timesheets, Vettel posting a 1m56.604s and Webber a 1m56.634s.
Alguersuari posts the first time of the session with a 2m00.237s.
Vettel and Webber in their Red Bulls are also among the first cars out on track.
Trulli and Kovalainen of Lotus and then the McLarens of Hamilton and Button soon follow.
Alguersuari and Buemi are the first our in the this session, Vergne having ceded his place in the cockpit to the former after a decent outing in FP1 this morning.
Here we go then! A further hour and a half of practice ahead...
Alan again: "Ok, scrap my previous tweet.... Big lump of rain just appeared on the radar. Looks like about 30 mins worth at least."
Renault operations director Alan Permane on his Twitter feed: "Radar is looking clear for the afternoon. Should get some running on dry tyres in P2 hopefully."
The weather forecast for this session was supposed to be good, but a big dark cloud is fast approaching and it looks like there could be at least 30 minutes of rain.
The opening session was a soggy affair, in which wet weather maestro Michael Schumacher went fastest.
Hello and welcome to our coverage of the second of the day's practice sessions ahead of Sunday's Korean Grand Prix.