Heikki Kovalainen reckons he's got a good set-up for Sunday's 52-lap British GP if the rain continues after finishing seventh on Friday.
With the rain bucketing down on the Northamptonshire track, Kovalainen showed some good pace on the full wet Pirelli tyres.
The Caterham driver posted a 1:58.580 during his 10 laps to finish 2.235s adrift of pace-setter Lewis Hamilton.
"I think that's the wettest day we've had in F1 for quite a while and that cut short the amount of running we could do today," he said.
"It was pretty treacherous out there in both sessions, more so in the afternoon when I was getting wheelspin at the end of the straight and when it's like that it's not worth risking the car, particularly when we have quite a lot of new parts on it that we need to take a look at as much as we can this weekend.
"As it was so wet I can't really say how much of an improvement we've made here, but this morning the car felt pretty well balanced as soon as I started to push a bit, so if it's raining like this on Sunday at least we know we have a decent set-up to race with."