Lightly spray a 4cm-deep, 23cm (base measurement) fluted tart tin, with removable base, with oil. Line the tin with the pastry sheets, overlapping slightly, and trim any excess. press the pastry sheets together to seal. Cover and place in the fridge for 15 minutes to chill. Line the pastry case with non-stick baking paper and fill with pastry weights or rice. Bake for 15 minutes. Remove the paper and pastry weights or rice. Bake for a further 5 minutes or until crisp and golden. Set aside in the tin for 30 minutes to cool completely.