A mobile fluid spray apparatus (1) comprising: a wheeled housing (2); a tank (30) disposed within the housing (2) adapted to receive a pressurised gas; a pressure regulator device (32) connected to an outlet of said tank (30) for regulating the output flow of the pressurised gas; a compartment disposed within the housing for removabley receiving a fluid container, said fluid container being connectable to the tank outlet via the pressure regulator device; and a hand-held spray gun (10) connectable to said fluid container for the controlled release of fluid from the fluid container when said fluid container is connected to said tank outlet.