Air Flows From High Pressure To Low Pressure Area Car Spray Guns 101 – Learning the Basics of Spray-Paint Gun Operation

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Car Spray Guns 101 – Learning the Basics of Spray-Paint Gun Operation

Once you’ve mastered the basics of your spray gun, you should become adept at adjusting spray patterns through fluid flow. Many guns are built with air micrometers, which can vary the pressure settings. If your particular gun does not have one, you can use a separate air micrometer. The width of the spray pattern is controlled by the fan. Most painters like to use a wide fan but keep in mind that the wider the fan, the less material will be distributed.

Many novice painters will complain about large drops. This is corrected by adjusting the fluid needle so that it allows less fluid to flow or uses more air pressure.

You will not find this applicable to HVLP guns. It only has 10psi to atomize. Most of them use an integrated air converter. The manufacturer will give you the proper inlet pressure to set the air pressure cap. This is done after you have set the fluid control and selected the correct nozzle.

Gradually increase the pressure and adjust the fan control to get the best performance from your HVLP gun at the air inlet. You can easily do this with an accessory air cap. It has dual gauges, which allow you to check center as well as horn air cap pressure.

The reason spray gun high efficiency is so critical is that many of the newer paints available on the market have low VOCs and high solids. Atomization becomes more difficult as the amount of paint increases.

Technique preferred

Now that your gun is ready to be perfected, it’s all up to you. If you’re not precise with your painting, you’ll get runs, pitting, and mottling.

You should always control your spray gun in the following areas…

a) Measuring the correct distance from the gun to the object

b) Appropriate trigger action

c) Control the speed at which you are working

d) The angle at which you hold the gun. This requires techniques such as healing towing and fanning.

e) Constantly watch what you are doing so that you apply evenly. Pass vertically at constant even speed. If you go slower you will apply more paint, if you go faster you will reduce the amount.

f) Make sure you wet the surface

g) Each pass must overlap the previous application by about 50%

h) Make sure you don’t double the same area

If you find a problem, flash the paint and fix the problem on the second pass. There will be some flow after application but this will depend on the amount of reducer and hardener you used. Once the paint is catalyzed, whatever is showing will remain until you fix it.

Remember to take your time following all the steps and you will overcome any weaknesses in your spray painting in no time with practice.

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