Nowadays electrostatic painting spray is used to colour car, cycle, cupboard or other things with help of static electricity. Spray gun is made in such a way that it produces very small charged particles of colour. The sharp edge of the electrostatic painting spray gun is connected to a terminal of the static electrical generator. The other terminal of the generator is connected to the metal plate to be coloured which must be connected with earth.
In case of colouring a car the charged small particle emitted from the spray gun attracts the outer frame of the car. As a result a uniform layer of colour is formed on the outer surface of the car. Moreover these small particles move along the electric lines of force and reach the narrower places of its surface and colour it.