About painting (2)


About painting processes



Painting processes are roughly divided into 4 parts on the left.


Depending on the condition of the groundwork, coating processes may increase or decrease, but 3 coats are basically applied.

At this time, you can make a beautiful finish by combining different paints.









Why do you recoat?

Imagine, for example, a house or a building such as a bridge.

Since those walls are always exposed to ultraviolet rays, heat, and rain and wind, deterioration with a single paint will inevitably accelerate. Overcoating gives strength to a coating film and protects a base from deterioration without repainting for several years to several decades.

In addition to providing durability, multi-coating is also effective when a base material is difficult to attach firmly with general paint. Before applying general paint, by applying another paint that is compatible with the paint and the base, it serves as a binder for the surface paint and the base, and the main paint becomes more beautiful and durable. By combining paints with different properties, the maximum effect can be achieved.

For example, there is a paint which has excellent weather resistance (properties that are resistant to discoloration or deformation due to temperature changes, rain, ultraviolet rays, etc.) and is ideal for exterior wall painting. However, the paint has the disadvantage that it is not airtight on walls such as concrete. In this case, you can solve this problem by first applying a paint, which has good airtightness to concrete and is compatible with the paint to be overlaid, on the base. Depending on the type of paint, each paint has its own advantages and disadvantages. The strength of multi-coating is that it can solve problems, which cannot be solved with one paint, in combination with other paints.


Difference in each coating method

When applying 3 layers of base coat, middle coat and top coat, it may take 1 day to coat 1 layer and dry.

Each layer has a different role, and if each layer is not well coated, it can easily become brittle and cause peeling.


It has the role of strengthening the currently applied paint (coating film) and the base of steel, concrete, etc., and increasing the adhesion between the base and the middle/top coat.


Intermediate coating (Middle coating)

The middle coat paint is generally the same* as the top coat paint. In the case of a rough surface, it is not possible to make a smooth surface with only the undercoating paint, so make the coating film thick with an intermediate paint to make a smooth surface. By doing so, not only the surface is beautifully finished after topcoating, but also the strength of the coating can be increased.


Overcoating (Top coating)

Since this coating is the top and the most important part of the appearance, we add thickness to the coating to enhance its aesthetics and weather resistance. It plays the role of protecting the base from sunlight (ultraviolet rays) and rain (water).


*Even thought the same coating material is used for the intermediate coating and the top coating, only the color may be changed in some cases. This is so that you can see at a glance if there is no unpainted portion when applying topcoat.

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