primer coating
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The use of the primer: why it is important and how it is applied

The use of the primer: why it is important and how it is applied

28 February 2023

Industrial coating processes can improve the aesthetic appearance of products and increase their resistance to corrosion, wear and atmospheric agents. One of the most important phases of the painting concerns the use of the primer. In this article, we’ll look at why primer is important and how it’s applied.

The primer is a base coat that is applied to the surface of the part to be painted before the final paint is applied.

 

The function of the primer is to prepare the surface of the article, increasing the adhesion of the final paint and creating a protective barrier against corrosion and wear.

 

In addition, the primer can also cover any defects or imperfections on the surface of the part, making it more uniform and smooth.

cabina macchina movimento terra primer
An earthmoving machine cabin to which primer has been applied.

The importance of the primer

The importance of using primer is mainly due to increasing the adhesion of the final paint and increasing corrosion protection.

 

The final paint needs a solid and uniform base to adhere to the surface of the part effectively. The primer provides this uniformity, creating a solid base to which the final paint can adhere optimally.

 

In addition, the primer protects the surface of the part from any damage that might be incurred by the final paint.

primer su componenti per macchine agricole
Primer on agricultural machinery components.

The steps of primer painting

Primer painting is an important process to ensure a quality finish to the surface. Here are the three main steps to follow:

 

  • Surface preparation: thorough cleaning of the surface to be painted is essential to achieve an optimal result. It is necessary to remove any residual dirt, rust, oxidation or other impurities on the surface of the artifact.
  • Primer application: once the surface has been prepared, the primer is applied. Spraying, brushing or dipping techniques can be used, depending on the needs and type of surface. The primer creates a uniform base for the final paint, improving adhesion and durability of the coating.
  • Surface finishing: after applying the primer, the surface is finished and prepared for application of the final paint. Finishing includes the removal of irregularities or any imperfections on the surface to achieve a smooth and uniform surface.

 

Primer painting performed following these steps results in a durable and long-lasting finish.

verniciatura liquido rossa su primer
Agricultural machinery components liquid-painted red after a previous application of primer.

Choosing the right type of primer

Choosing the type of primer to use to paint a part depends on a number of critical factors that include the technical specifications of the material, its composition, and its intended use in the relevant industry. Specifically, there are several types of primers to choose from, each with unique and distinct characteristics and advantages.

 

For example, epoxy primers are known for their high resistance to corrosion and wear, as well as their long service life. These primers are ideal for applications in aggressive or corrosive environments, such as in the chemical, petrochemical and marine transportation industries. They can be applied by spray (in liquid or powder form) or by immersion (such as e-coating, galvanizing, etc.).

 

On the other hand, acrylic primers are known for their ease of use and quick drying, making them ideal for applications where processing time is limited. These primers are often used in the furniture and furnishings industry, as well as in the printing and graphics industry. Recently they have also found a place in applications on manufactured goods intended for outdoor use.

 

In any case, the choice of the type of primer best suited to the needs of the part to be painted always depends on a careful evaluation of the critical factors and specifications of the application. Some of the parameters that can affect the choice include operating temperature, humidity and the presence of aggressive chemicals in the surrounding environment.

 

It is therefore important to carefully consider all these variables and choose the primer that can provide the best performance for the specific application.

The use of the primer: why it is important and how it is applied

Conclusions

In conclusion, the use of primer is an important step in industrial coatings. The primer prepares the surface of the workpiece, increases the adhesion of the final paint, and better protects the surface from damage.

 

Primer painting is done in three main steps: surface preparation, primer application, and surface finishing. The choice of the type of primer to be used depends on the specifications of the part and the requirements of the industry in which it is used. Primer painting is therefore a critical step in industrial contract coating.