Jenson Button says Saturdays third practice session ahead of the Korean Grand Prix will be vital to give teams some dry track going into the remainder of the F1 weekend at the Yeongam circuit.

Button posted the second fastest time behind McLaren team-mate Lewis Hamilton in Friday's wet sessions but agreed with his fellow Briton that it was difficult to judge the relative levels of performance of the different teams given the conditions on track.

With the remainder of the weekend expected to be dry, Button admitted that a solid final practice session would now be vital to allow teams to work on set-up and also sample the dry Pirelli tyres on high fuel loads.

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"Our car was quick in today's conditions," he said, "but it's difficult to say how it will be in the dry. I hope it'll be the same: it'd be nice to have the same gap back to the cars behind, but that's unlikely.

"We didn't really learn too much today - the humidity was so high that the track never really dried out. It looked like it was going to be dry right at the very end, but you couldn't get any grip from the slicks because you couldn't get any temperature into them.

"Over the last few races, we've been getting stronger in qualifying. I'd love to qualify well here, and I'll definitely be giving it a go, but P3's also going to be very important tomorrow because nobody knows how the cars behave on high fuel and dry tyres.

"There's a lot more to understand."