Many of you use (or want to use) a paint spray gun for your home renovation work.

However, not all paint spray guns are the same and are not intended for the same purposes.

In this article, we will try to tackle the subject in its entirety by showing you examples of low-pressure paint spray guns from the professional sector. On the one hand because this is our core business and on the other hand because we want to show you quality equipment and not 15€ gadgets that will break as soon as they are used for the first time (we say that, we say nothing).

What is a low-pressure spray gun ?

It is a mechanised spraying system that allows a material (mostly paint) to be sprayed onto a substrate by means of a turbine, battery or electrical cord.

Types of low-pressure paint spray guns

There are models with a bucket (by suction or gravity) located on the gun itself or with a painting station (with hopper or suction system).

In this case, the port is lighter for the user and you can project larger quantities at once, unlike the cup where you are limited to one litre in general per application.

The main advantages compared to roller and brush are :

  • Speed of work
  • Smooth quality of spraying
  • Ease of use

 

Materials and fields of application

This depends of course on the spray gun, but in general these small devices are used for small interior renovation works and can spray materials such as :

  • Lacquers
  • Varnish
  • Primers
  • Interior acrylic paints
  • Metallic paints

Low pressure versus high pressure

Until a few years ago, HVLP (High Volume Low Pressure) pumps dominated the market in terms of low pressure, i.e. spray gun systems adding a large volume of air at very low pressure.

The application quality is very good and still makes them a very popular system among professional craftsmen.

The main difference between a low-pressure and a high-pressure paint spray gun is…the pressure!

Higher pressure means (theoretically) spray mist. But that was before the advent of low-pressure airless nozzles.

They have been on the market since 2017 and they allow the HVLP system to compete on these main strengths. On the other hand, they only work with an airless gun.

Here are the advantages of these low-pressure airless nozzles :

  • Up to 50% less pressure for a homogeneous finish quality
  • Easier spraying on all materials and surfaces
  • High quality finish with less pressure
  • Double nozzle life
  • Reduced preparation and cleaning time
  • Can be used with all airless sprayers – increased versatility and profitability of a machine

 

Tips for using a low-pressure paint spray gun

It all depends on the right choice of machine, accessories and materials.

We are not going to go into detail but will give you global information to paint well with a spray gun. However, you can find more detailed information in other articles in our blog by clicking on the green links below.

Viscosity and preparation of the paint

The paint used is more or less thick (a varnish is for example more fluid than an acrylic paint) depending on its components. To make it more liquid (and therefore easier to apply), you can thin the material slightly, usually between 5 and 10%.

Sometimes spray guns are delivered with a viscosimeter, a small cup to measure the thickness of the paint according to its flow time. Refer to the technical data sheet of the paint and spray gun manufacturer for details.

Machine settings

First of all, you will need to set the pressure of your machine correctly. If you are new to this, you will need to do some tests beforehand on a piece of cardboard for example. It’s all a matter of experience and practice.

Furthermore, the choice of accessories can make your task much easier, especially the choice of station and nozzle in relation to the material to be used.

Ask yourself the right questions before buying a machine that may not be powerful enough for your job.

More information on –> The 5 biggest mistakes to avoid when spray painting

Spraying techniques

Here are the main points to take into account in your work:

  • Distance from the substrate (approx. 25 cm)
  • Application speed (not too fast, not too slow)
  • Spray angle (always 90 degrees)
  • Position (always be in motion before pulling the trigger on the spray gun)
  • Overlaps during your passes (50-50)

More information on –> Spraying Airless for Dummies

Note Bene: Airless Discounter is certainly a retailer in the professional sector. However, we regularly receive enquiries from customers who are looking for spare parts for their low-pressure spray guns in the consumer sector.

Please be aware that there are very few spare parts available for repairing spray guns in the private sector as opposed to professional spray guns.

Please take this information into account before you buy, because once the gun has a technical problem, it is rarely possible to repair it.

Cleaning & maintenance

In principle, all painting stations have more or less the same cleaning procedure. The main difference is whether you have a spray gun with or without a cup.

The video below shows you the cleaning steps for the Graco Ultra low-pressure spray gun with cup.

 

To clean your low-pressure paint gun, you can use the cleaning product of your choice (especially the one recommended by the paint manufacturer).

For a complete overhaul of your equipment before winter, we recommend our complete article on the maintenance of an airless pump.

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Questions or queries ?

For any further questions or if you would like to get your hands on one of these products seen in this article, you can contact us on +49 (0) 30 220 15436, fill out our contact form or email us.

If you wish to purchase one of the products mentioned above, you can check them out in our online store.

You can also visit us at our service base during office hours.

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