The generally known paint application procedures are :

• Brush application
• Spray application
• Electrostatic spray application

Brush Application

Spray Application
Spray gun will have a chamber to store the paint. Air at some pressure is delivered to the nozzle of the gun from an air compressor. Paint and air are mixed at the nozzle point in the spray gun and sprayed onto the component. There are many combinations of the mixture of paint and air to obtain different desired effects. The air intake may be low volume and high pressure or high volume and low pressure as is required. Added to this the design spray gun nozzle varies to produce different spray patterns.

Airless Spray
This method uses paint under high pressure at about 500 to 6,500 psi. The airless spray system is more portable, produces a higher film build, and cuts overspray considerably.

Electrostatic Spraying
The differences between this and air spraying are that the electrostatic gun has an electrode at the nozzle and the object to be painted is grounded.  The charged paint is attracted to the grounded object. The advantages are a reduction in overspray requiring less pressure. Paint is forced to travel towards the object because of the nature of electrical conductivity. This nature also allows a wrap-around effect in the sense the paint spry travels around and applies to the object though not within the direct sight of a spray gun.

The disadvantage being only one coat is possible because the first layer acts as an insulator. Some non-conductive materials too can be painted.