A method and apparatus are presented. A first roller has a sensor that senses a speed of the workpiece while the workpiece is in contact with the first roller and moving relative to the first roller causing the first roller to rotate. The sensor senses the speed of the workpiece from a rotation of the first roller. A second roller causes the sealant on the second roller to be applied to a surface of the workpiece when the workpiece is in contact with the second roller and moving relative to the second roller. The second roller is rotationally linked to the first roller. A third roller causes the sealant on the surface of the workpiece to spread on the surface when the workpiece is in contact with the third roller and moving relative to the third roller. The third roller is rotationally linked to the second roller.