The primer is the first layer of the coating system, which is used to improve the adhesion of the topcoat, increase the fullness of the topcoat, provide alkali resistance, and provide anti-corrosion functions. At the same time, it can ensure the uniform absorption of the topcoat and make the coating system play best effect. If the topcoat is of good quality, it is not necessary to use the primer. This statement is not correct, because the function of the topcoat and the primer is different. The topcoat focuses more on the final decoration and appearance, while the primer focuses on improving adhesion and anti-corrosion functions and alkali resistance.
When painting, sometimes we run into some little troubles. If the absorption is too fast when painting, the amount of paint cannot be applied to the predetermined area; Discoloration problems occur soon after painting, and even paint film peeling, lumps, and mildew spots often make us feel helpless.
This is because wood will have alkalization problems due to excessive moisture, especially in humid environments, which is the fundamental cause of affecting the quality of the paint finish. The role of the primer is to:
1.Sealing: Some walls are highly alkaline, and after being soaked in moisture or water, alkali blooms, the scientific name "pan-alkali", will cause crater-like protrusions on the surface of the paint film, and in severe cases, alkali frost will form on the surface of the paint film. Eventually the paint film is destroyed. Lacquer primer can act as a sealer.
2.Adhesion: The emulsion content in the primer is higher, and the adhesion is stronger. It can improve the adhesion of the paint film to the substrate.
Applying a layer of sealing primer before painting can not only save the cost of painting, but in the long run and decorative effect, painting the primer has the advantage of getting twice the result with half the effort. At the same time, the good adhesion of the primer makes the substrate smoother, making the topcoat easier to paint, and reducing the amount of topcoat used. In this way, the furniture not only avoids paint disease, but also helps to maintain the effect for a longer time.