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General information about spray guns
Types of spray guns
Paint guns are available in various designs to meet different requirements and applications. The three main types are:
- Airless paint spray guns: Work without additional air supply and are ideal for thick, high-viscosity materials and large surfaces.
- Airspray / HVLP paint spray guns: Use air for atomization and are particularly suitable for fine, even coatings and lower material consumption.
- Air Combi paint spray guns: Combine the advantages of airless and airspray by additionally using air for fine atomization, resulting in high-quality finishes.
Key Manufacturers
SATA
SATA paint guns stand for the highest precision and quality. They offer both RP and HVLP paint guns and manufacture all devices in Germany. SATA is a global leader in liquid painting technology and supplies customers in approximately 100 countries.
DeVilbiss
DeVilbiss is known for developing and introducing the first "TransTech" spray guns, which reduce overspray and VOC emissions. Their spray guns offer excellent ergonomics and innovative designs and are particularly environmentally friendly.
Graco
Graco is a leading manufacturer of airless sprayers known for their reliability and efficiency. Their equipment is particularly suitable for industrial applications and large projects requiring high coverage.
Wagner
Wagner offers a wide range of paint guns and sprayers for various applications, from DIY enthusiasts to professional painting companies. Their equipment is known for its user-friendliness and high quality.
Airless
What is the "airless process"?
The airless paint spraying process is a technique in which the material to be applied is pressurized by a pump (e.g., a piston pump or diaphragm pump) and pumped through a high-pressure hose to the airless gun and nozzle, where it is atomized. Since no additional air is required for atomization, it is referred to as an "airless" spraying process.
Which materials are suitable for airless paint sprayers?
Airless paint sprayers can process a wide range of low-viscosity to high-viscosity materials, depending on the performance of the equipment. Suitable materials include:
- Water-based or solvent-based 1K and 2K paints
- Primers
- Primers
- Stains
- Fillers
- Interior and exterior emulsions (e.g., facade paints)
- Latex paints
- Corrosion inhibitors
- Airless spray fillers and roof coating materials
Design of Airless Paint Sprayers
Airless paint sprayers can be powered pneumatically, electrically, or by an internal combustion engine. The system essentially consists of a pump, a high-pressure hose, an airless gun, and a nozzle. The pressure is built up by a piston or a diaphragm, sucking in the material and conveying it through the hose to the nozzle, where it is finely atomized.
Advantages of the Airless Spraying Method
The advantages of the airless spraying method are numerous. Economic advantages include greater surface coverage and time savings compared to conventional methods such as rollers and brushes. Furthermore, the method enables a uniform and perfect surface with high coverage in a single application. Thanks to optimized site logistics and the positioning of the pump, the laborious task of lugging buckets is often eliminated.
Disadvantages of the Airless Spraying Method
A frequently cited disadvantage of the airless method is the development of overspray. However, this can be minimized by properly coordinating the system (working pressure, nozzle, material). For experienced users, the masking effort remains manageable. However, masking, commissioning, and cleaning should be included in the calculation.
Airspray
How do I find the right nozzle size for my airspray / HVLP paint gun?
Selecting the right nozzle size for an airspray / HVLP paint gun is crucial. The choice depends on the flow rate, the pressure used, and the material. Here is a reference table for nozzle size selection:
- 2K paints: 1.3 to 1.4 mm
- Basecoats: 1.2 to 1.4 mm
- Primers: 1.5 to 2.0 mm
- Spray fillers: 2.5 to 3.0 mm
- Water-based paints: 1.3 to 1.4 mm
These recommendations are based on experience and may vary.
