Airless Spray System

The airless spray system is a coating method based on the principle of forcing paint through a gun without the use of air, using a pressurized pump to deposit it onto a surface. In this method, atomization is achieved not by air but by the kinetic energy of the liquid under extremely high pressure. It is widely used in industrial applications requiring rapid and thick coating of large surfaces.

Working Principle

• Paint is pressurized to high levels (typically 150–250 bar) using a piston or diaphragm pump.
• It is atomized by being forced through a narrow nozzle tip.
• The spray pattern is determined by the nozzle shape and paint properties.
• Since no air is used, paint mist does not mix with the surrounding environment, increasing spray density.
• A thick and uniform film can be applied in a single pass.

Advantages

• Large areas can be coated quickly and efficiently.
• High film thickness can be achieved in a single coat.
• Overspray (excess spray loss) is low due to the absence of air atomization.
• Air-related issues such as bubbling, contamination, or moisture effects are minimal.
• Suitable for interior and exterior applications, heavy industry, and steel construction projects.
• Compatible with various paint types including solvent-based, epoxy, and polyurethane.

Disadvantages

• Potential for an orange peel appearance on fine or delicate surfaces.
• Must be used with caution due to extremely high pressure (poses health and safety risks).
• Paint penetration may be reduced on complex geometries.
• Cleaning the system during color changes is time-consuming.
• Requires a trained operator; incorrect nozzle selection affects quality.

Applications

• Steel structures and construction systems.
• Industrial tanks and pipeline systems.
• Ship hulls and heavy industrial platforms.
• Bus, truck, and agricultural machinery bodies.
• Fire escapes, racking systems, and exterior steel facades.
• Concrete surface priming and epoxy system applications.