Mark Webber may have set the pace on the opening day at Spa-Francorchamps but like all the drivers' and teams' he was disappointed not to have been able to do more dry running.

Webber eventually finished proceedings having posted a 1 minute 50.321 second lap, which put him 0.140 seconds up on Fernando Alonso's Ferrari.

However while he did do 30 tours in total in his Renault-powered Red Bull RB7, only four of those were in the dry as both Friday sessions were rain hit affairs.

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"The weather was a little bit up and down today - we got some dry running in, but only around four laps: two laps on the soft tyre and two on the medium," Webber confirmed. "Otherwise we were just doing general housekeeping, looking at ride heights, brake balance and all that stuff before we get the car to the limit.

"We need to get out there and get the mileage in, but on the other side of the coin we need to save tyres for Saturday and Sunday.

"The kerbs are the hardest thing here when it's wet, it makes the white lines like ice and it's very easy to make a mistake."

Team-mate and runaway championship leader, Sebastian Vettel meanwhile concurred that conditions were far from easy. He finished FP1 in fourth and was tenth in FP2.

"It was quite tricky because the weather changed all the time and it's a shame that in wet conditions we only have one free set of intermediates for the rest of the weekend, as you want to save tyres for Saturday and Sunday," Vettel said.

"We had a little bit of running in the dry and tested some updates; I think we got a decent result on those.

"It was difficult to judge lap times and the overall pace today, but the car feels okay. Let's see what we can do tomorrow."