Lucy, this summary might help you.

Methods: Paint Application

Airspray
The airspray gun uses air at 30 to 85 pounds per square inch (psi) to atomize the paint into a fine spray. This produces a smoother finish, and can be used on many surfaces.

A High Volume Low Pressure (HVLP) spray gun uses a higher volume of air at only 10 psi. This reduces the overspray and increases the transfer efficiency.

Airless Spray This method uses paint under high pressure, 500 to 6,500 psi. Airless spraying has several distinct advantages over air spray–it is twice as fast, produces a higher film build, is more portable, cuts overspray by more than half, and is thus cleaner
and more economical

Electrostatic Spraying The differences between this and air spraying are that the lectrostatic gun has an electrode at the nozzle and the object to be painted is grounded.

Powder Coating This is a variation of electrostatic spraying. The difference is that what is sprayed is a paint powder. The object is then baked

plasma powder coating. The powder is fed into an extremely hot gas stream and is then sprayed at the object. Plasma poder coating

flame sprayed powder coating, where the powder is melted with a high temperature flame. Again, it is for large objects and overspray cannot be reused.

Extrusion Coating. The paint is extruded from a nozzle directly omto the surface.

Rotary Atomizing Another variation of electrostatic painting, rotary atomizers use centrifugal force, not air or hydraulic pressure, to drive the paint out of the nozzle.

Dip Coating With this process, parts are dipped into a vat of paint. This allows for a high production rate and transfer efficiency, and it requires relatively little labor.

Flow Coating With this method, parts are carried on a conveyor. Anywhere from 10 to 80 streams of paint coat the parts. This system has the advantages of dip coating, along with low installation costs and low maintenance requirements.

Curtain Coating Instead of many streams of paint, curtain coating uses a waterfall flow of paint to coat parts on a conveyor belt.

Roll Coating Paint is applied to auxiliary rollers, which then transfer the paint to the application rollers, which run across the part. This method has a high transfer efficiency and high production rates, but is limited to flat work.

Electrocoating (or Electrodeposition) Parts to be painted are dipped into the paint. Then
a current is applied, which electrically deposits the paint on the object. Parts are made primarily of steel. The transfer efficiency of electrocoating is over 90%.

Autodeposition This is a dip process where organic paints are precipitated onto iron, steel, zinc and zinc-alloy plated objects. It is effective for its anti-corrosion properties and coverage of objects.