Particulate material for coating foodstuffs falling from a belt of a conveyor within a rotatable drum is distributed substantially evenly over the interior wall of the drum by a guiding device which includes at least one movable plate which is positioned below the belt and which has a longitudinal axis parallel to the end of the belt. The particulate material distributed from the belt to the drum is conveyed by the drum to a conveyor which delivers particulate coating material to a foodstuff to be coated.