A transport vehicle spray apparatus. The transport vehicle spray apparatus has at least one storage tank. A pump transports material from the storage tank through at least one filter and a manifold to at least one spray bar. The spray bar incorporates spray nozzles through which the material from the storage tank is dispensed. In one embodiment, the spray bar is connected to a collapsible frame on the top and back of the transport vehicle storage space. The collapsible frame can expand and collapse by sliding along the length of the walls of the transport vehicle storage space. As the frame expands and collapses, the spray bar coats the interior surfaces of the transport vehicle storage space with the material from the storage tank. The transport vehicle spray apparatus is utilized to spray and coat the walls of a transport vehicle's storage space with a desired fluid.