What is Airless Spraying?
Airless Paint Spraying – Technical aspects used for successful paint application of material using airless equipment for protective coatings and linings are explained here in this article.
In this article, I will go through some of the main principles that are necessary for successful spray applications.
Spray Application Techniques
A few times spray application methods are overlooked by the sprayers. These if continued can lead to detrimental effects on the spray application performances.
Often in industrial coating applications, the sprayer might overlook certain application techniques and hamper the production.
Therefore, if failed to implement these correct requirements on regular basis can lead to several painting defects such as sagging, running, over thickness, low thickness, dry spray, overspray.
Numerous coating issues can be avoided by following correct application methods therefore the vertical passes must be applied first followed by the horizontal passes moving from right to left with minimal overlap.
The spray gun is then turned to 90deg. And sprayed horizontally holding it 12 – 18 inches from the substrate.
This forces coating into the profile maximizing mechanical adhesion and encouraging good surface wetting characteristics.
Then once this is achieved the distance of the spray gun from the distance is extended to 23 – 36 inches. This decreases the formation of orange peel defects giving more even coverage.
Keep in mind the skills of the applicator along with the coating material and time that will determine the actual distance from the surface.
Important Tip – Airless Paint Spraying
One is advised to use the correct tip sizes and check the tip conditions regularly – for example using a tip that is too large will result in excess paint being applied to the surface.
Firmly hold the airless spray gun with a comfortable grip using the index finger and the middle fingers to trigger the spray gun.
Ensure to hold the gun flexibly in one hand and the fluid in the other hand keeping the safety aspects in minds such as installing the whip-hose between the end of the supply hose and the gun that will allow flexibility to the sprayer.
Outside Corners/ Inside Corners – Airless Paint Spraying
Corrosion rapidly occurs on the corners and edges than on the plain surfaces. Therefore, when painting the corners and edges the applicator must paint directly onto the corners.
To give extra protection to corners and edges they must be stripe coated with the spray gun to ensure proper and full coverage.
The right techniques are essential in corners and edges for the longevity of steel materials.
Paint Mixing Techniques
Accurately mixing paint is critical for success therefore, the paint must be automized correctly for uniform coverage and long term coating performances.