What Is a Primer?
Primer is a paint used as a sealer or base coat for painting.
It is used for exterior and interior wall painting and repair at construction sites.
Water-based, oil-based, and various other types exist, so it is important to select one with the appropriate effect for the type of object to be painted.
Uses of Primer
Primer is used when painting exterior and interior wall work. Painting is done in three stages, including “primer,” “middle coat,” and “top coat,” and primer is used in the “primer coat” stage.
Primer coating improves the finish of the top-coated surface, which is the final painted surface, and reinforces the substrate. The major advantage of this method is that it not only provides a beautifully finished product, but also prevents deterioration.
Principle of Primers
The word means “to cover,” “to adhere,” or “to seal.” As the name implies, applying Sheila as a primer coat when painting strengthens adhesion.
In addition, it also has the effect of increasing the strength of the wall surface and delaying deterioration. Sheilas are also available in water-based and oil-based types, each with different benefits and purposes.
Water-based types should be coated with water-based paint, while oil-based types should be coated with oil-based paint.
1. Water-Based Type
The water-based type is used mainly for painting indoor wallpaper and ceilings because of its relatively low odor. A film is formed when the water contained in Sheila evaporates. However, because it is easily soluble in water, it is not suitable for exterior walls, which are susceptible to rain and other external environmental influences.
2. Oil-Based Type
The oil-based type has a strong odor, but has a high permeability and excellent reinforcement effect, so it is mainly used for heavily deteriorated painted surfaces such as exterior walls.
Features of Primers
Depending on the type of primer the following differences also exist. Therefore, it is important to select the best one for your application.
1. Improved Adhesion Between Painted Surface and Paint
Primer acts like an adhesive. Rather than applying the top coating material directly to the wall surface, applying the sealer between the two will allow the sealer and the paint to adhere to each other, preventing deterioration such as peeling of the paint film.
2. Control of Paint Absorption During Painting
If paint is applied directly to a wall surface that has not been coated with paint, the paint will soak in at once and may change color or become uneven. In particular, if the wall surface is scratched, paint can easily penetrate through the scratches.
Applying Sheila first will prevent the paint from being absorbed by the middle and top coats and will result in a cleaner finish.
3. Can Reinforce the Substrate of the Painted Surface
By applying a coat of Sheila to the surface to be painted, the deteriorated substrate can be reinforced. By reinforcing weathered concrete or mortar with Sheila, not only can the paint be applied more beautifully, but it will also provide corrosion and corrosion protection.
Types of Sheila
The type of Sheila to be used depends on the desired effect and the material of the painted surface.
1. Sheila for Burnishing
It is mainly used on interior walls and ceilings. It can be applied over wallpaper that has been soiled by cigarette smoke or rain stains, and it also reduces staining on the paint.
2. Cationic Sealer
Sheila has excellent permeability, adhesion, and economy, and can be used for both exterior and interior walls. The two types, the film-forming type, which produces a thin film, and the penetration type, which penetrates into the substrate, offer a wide range of application possibilities.
The transparent type is effective in reinforcing deteriorated wall surfaces, while the white type fills in minute holes in the wall surface to make it easier for the top coat to adhere. However, it is necessary to note that strong solvent paints cannot be used for the top coat.
3. Sheila for Concrete Reinforcement
It is durable and prevents dust and dust formation. Ideal for use on concrete and mortar.
Other Information About Sheila
Difference From Primer
Primers are used as the same primer, but there are some differences, although they are still effective in improving adhesion.
Primers are mainly used on metal parts and plastics with poor adhesion. In addition to adhesion, primers smooth uneven surfaces and prevent rust.