Valtteri Bottas says he is eager for Williams to focus on its performance after stating that he is not worried about the reliability of the Mercedes-powered FW38.
Bottas topped the times on the second day of testing in Spain, having clocked a time of 1:23.261 on the Ultra Soft tyres, having racked up 107 laps.
Bottas will now hand over to team-mate Felipe Massa for the remainder of the test.
"Today was a good day, good amount of kilometres again, that’s it from my side for the testing, I'm feeling positive with the progress we have made, I’m sure there’s still plenty of areas we can work on," he explained.
"For sure with a new car we have had some small things [go wrong] here and there but they’ve not been massive problems, all fixable, I'm not worried about reliability, [it's a] reliable car, we just need to make sure it’s quick"
Bottas believes Williams had a package which will leave it in a good position when the season begins in Australia.
"There’s still quite a bit more to come, we’ve been learning a lot and there’s still two days left, I’m sure we’re going to have some bits as well for Melbourne, should be a step, but this is a good starting point," he concluded.