Abstract: A method and apparatus for dispensing a substance to a work area in which the method includes the steps of determining the quantity of the substance to be dispensed substantially evenly to the work area, calculating the rate of dispensing the substance to the work area for the quantity determined in the determining step to achieve substantially even dispensing, dispensing the substance to the work area at the calculated rate during movement over the work area, and adjusting the rate of dispensing at intervals during such movement to minimize error in such dispensing.