Conventional air spray has decreased in popularity due to the high material costs of modern day paints and government EPA limits and regulations in many markets including the auto and wood finishing markets. Conventional air spray guns suffer from poor transfer efficiency. With conventional equipment only 1/3 of the material gets applied to the surface. The rest is lost in the air unless you have an expensive recapturing process or facility.
The most efficient way to paint your car is using an HVLP spray gun. Modern high volume, low pressure spray guns are highly effective at atomizing 'larger volumes of paint and this helps professional sprayers to achieve better topcoats. HVLP paint spray gun is a kind of tools that applies the high flow and low pressure power to make the sprayer works. HVLP paint spray guns are designed to improve transfer efficiency. HVLP guns push paint particles at about half the velocity of conventional spray guns. While this means you have to spray closer to the surface, you gain by having your material actually get applied to the object instead of floating into the air. If you set up the spray gun correctly you will significantly cut down on the spray "fog" or overspray, and since you are painting in your garage, that might be a great advantage.
With the efficient HVLP paint sprayer, you can paint your own car and save a ton of money. Enjoy It!