Jenson Button believes drivers will have to tread carefully with the supersoft tyres in Sunday's Canadian GP after the McLaren driver experienced graining within a handful of laps in practice.Pirelli have brought the two fastest tyres in their range, the soft and the supersoft, to this weekend's Montreal event and drivers put the latter to the test during Friday's afternoon session amid increasing track temperatures on both high and low fuel. Button, who finished ninth on the P2 timesheet, said graining on the rear of his MP4-29 had certainly proved noticeable when he pushed to the limit. "I hammered it on the high fuel for a few laps to see what would happen," the Briton told...
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