Abstract: An automatic vehicle spraying system comprising a spray apparatus positioned on a boom. The spray apparatus is not rigidly fixed to the boom, but instead is able to be raised and lowered from the boom. A vertical sensor and a horizontal sensor detect when a vehicle passes underneath the spray apparatus and transmit an electronic signal to a programmable logic controller. The controller then determines if the vehicle is in the proper position, causes an actuator to lower the spray apparatus from the boom toward the vehicle surface, and causes the spray apparatus to begin spraying a fluid onto the appropriate vehicle surface. In particular, this invention is useful for the application of asphalt release agents to trucks used to transport asphalt.