Home renovation needs to use paint coatings, go to the building materials store to buy and found that now many of the wall paint will be divided into primer and topcoat. The primer is used on a layer that is in contact with the wall, and the topcoat is a layer on the surface. You may know this simple distinction, but the price difference between the primer and the topcoat is not small. What is the difference between the two in effect? The following Xiao Bian will take you to understand.
First, the role of primer:
The primer is the first layer of the paint system. It is used to improve the adhesion of the top coat, increase the fullness of the top coat, provide anti-alkaline, provide anti-corrosion function, etc., and at the same time can ensure the uniform absorption of the top coat, so that the paint system can play the most Best results. No matter how good the top coat is, it needs to be primed first to improve adhesion, anti-corrosion, anti-alkali and so on.
Applying a layer of sealing primer before applying the top coat can not only save the decoration cost, but also has the advantage of being more effective when used in the long-term and decorative effect. At the same time, the good adhesion of the primer makes the wall more smooth, making the topcoat easier to apply and reducing the amount of topcoat used. In this way, the wall surface not only avoids the paint disease, but also helps to maintain the brushing effect for a longer time.
Second, the role of topcoat:
The finish is the final coating of the finish. It is the last layer applied to the wall decoration of the building. The overall effect of the finish is reflected through this layer.
Topcoats are very demanding on materials, have good color and brightness, and should have good resistance to external conditions. They must also have the necessary hue and decorative properties and have a protective effect on the primer. Topcoats for outdoor use should use coatings with good weatherability. The decorative effect and weatherability of the topcoat depends not only on the paint base used, but also on the pigment used and the preparation process.
Third, the difference between topcoat and primer:
1, different composition:
The primer is composed of four parts: resin, filler, solvent and auxiliary agent; the difference between the top coat component and the primer is mainly that the filler of the former is added little or no.
2, play a different role:
Primer is the first layer of the paint system, used to fill the paint surface, support the topcoat, provide fullness, reduce costs, and help save energy; finish coating is the final coating of the coating, and is the final in the decoration of the building wall. Apply a layer to increase the thickness of the paint film by increasing the number of coats of the top coat and by applying a thick top coat. The thickness of the coating is mainly provided by the primer, while the topcoat is mainly used for decoration and protection.
Fourth, how to use primer and topcoat?
Both primers and topcoats are latex paints, which are generally used in conjunction with each other and have different effects. When you brush the wall, you can brush the primer after the putty dries out. You can usually do the primer two times and finish the paint three times. Each time you paint the paint, dry it again and then brush it again. When the primer is applied, the amount of paint on the wall is larger, and the amount of water added to the primer is a little more to ensure even brushing. Do not add too much water to the top coat when it is applied. This will affect the film thickness, feel, and hardness of the paint film. It can be diluted a little at a time.
Primers and topcoats are like people's right and left hands. Both the good and bad effects of wall paint painting require the participation of both of them. So, don't think that you've saved the primer with a good finish. Of course, don't use a good primer and the wall paint will make do.
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