To obtain a high-quality finish on painted surfaces in the industry, it is crucial to carefully prepare the objects before applying the paint. Regardless of whether we are talking about painting car elements, electronic devices or furniture, the surface preparation process is similar and aims to ensure optimal paint adhesion. Effective preparation includes a number of activities, such as degreasing, grinding and other methods, which together create a solid base for further stages of work.

Degreasing – what is it?

Degreasing is the first and one of the most important stages of preparing the surface for painting. This is the process of removing contaminants such as oils, greases and other organic substances that may negatively affect the adhesion of the paint.

• The use of solvents – special chemicals are most often used that dissolve fats without damaging the surface.
• Ultrasonic cleaners – for more complex shapes or delicate materials, ultrasonic cleaners are used.
• Steam method – sometimes it is also recommended to use hot steam, especially in the food industry.

The degreasing process is crucial because even small grease residues can lead to the formation of air bubbles under the varnish and, consequently, to its detachment from the painted surface. The accuracy of this stage directly translates into the quality and durability of the final finish.

Surface grinding – when should it be done?

Grinding is a process that aims to smooth the surface, remove old layers of paint or varnish and increase the adhesion of the new layer.

• Removing unevenness – by sanding we get rid of all unevenness, including scratches and thickening, which ensures a uniform paint coating.
• Increased adhesion – a rough surface retains paint better, which increases the adhesion and durability of the finish.

The choice of the appropriate grit of sandpaper and sanding technique (hand or machine) depends on the type and condition of the surface. Remember to sand evenly to avoid creating additional unevenness.

Other methods of preparing the surface for painting

In addition to degreasing and sanding, there are other surface preparation techniques such as:

• Sandblasting is a method of mechanical cleaning of surfaces using an abrasive stream. It is particularly effective in removing rust and old paint layers.
• Phosphatization – a process of chemical treatment of metal, aimed at increasing corrosion resistance and improving paint adhesion.

Each of these methods has its own application depending on the type and condition of the surface and the requirements of the final product.

• The appropriate selection of the method is crucial to ensuring optimal conditions for painting.
• Adhesion testing – it is recommended to perform paint adhesion tests after using the selected preparation method.

Preparing the surface for industrial painting is an essential step that determines the quality and durability of the final finish. Properly performed degreasing, grinding and other surface preparation techniques provide the best conditions for the application of paints and varnishes. A professional approach to this process, together with the proper selection of methods and tools, allows for achieving a high-quality finish that is resistant to damage and weather conditions.