Primers and topcoats are both latex paints. If you plan to buy paint, then you must understand the difference between primer and topcoat, and how to use both primer and topcoat. Today, the decoration house Xiaobian will tell you about the difference between the primer and the topcoat.
Primer is a liquid that is usually white in color and has a certain viscosity. It can be directly applied to the surface of the object. It is the first layer of the paint system. It is used to improve the adhesion of the topcoat and increase the fullness of the topcoat. Improve the decorativeness of the topcoat, provide anti-alkaline, provide anti-corrosion function, etc., and at the same time ensure the uniform absorption of the topcoat, so that the paint system can exert the best effect. Generally, it can be divided into the first primer and the second base according to the coating requirements. Paint and so on.
The role of the topcoat is mainly scratch resistance, hardness, gloss, hand, transparency, aging resistance, yellowing resistance, etc. The quality of the topcoat directly affects the quality of the entire paint film, but the role of the primer is also very important. The primer mainly has the following effects:
1. Closed
The primer effectively seals the base layer and makes the wall base stronger. Some walls are more alkaline. After soaking in moisture and water, they produce alkali flowers. The scientific name is “pan-alkaliâ€. This situation causes crater-like protrusions on the surface of the paint film. In severe cases, a layer of alkali cream is formed on the surface of the paint film. Eventually the paint film is destroyed. The latex paint primer can act as a seal to alleviate this condition. However, if the wall of your house is relatively dry and the floor is high, there is no possibility or no problem, but it is recommended that you use it, so it is safer.
2, adhesion
The primer can enhance the adhesion of the topcoat and improve the bonding force between the latex paint film and the wall surface to prevent the skin from peeling off.
3, fill in
The primer can make up for the slight cracks and improve the flatness of the wall. If your wall is flat, you can use the primer without it.
4, cost savings
The price of the primer is generally cheaper than the top coat, so painting the primer before applying the finish can save the cost of the decoration.
The difference between primer and topcoat:
First, the composition of the two is different. The primer contains the resin, additives, solvent and filler, while the topcoat is made of resin, solvent, auxiliary and little or no filler. composition;
Second, there is a different effect between the two. In the paint system, the primer is the first layer that is brushed up. Its main function is to make the paint surface flat, thus supporting the paint on the surface. The paint surface looks more plump, which reduces the cost of decoration and saves energy. The top coat is the last “gatekeeper†in the entire paint system, which can reflect the gloss, feel and scratch resistance of the entire paint surface. The characteristics of the injury and so on, so the quality of the topcoat directly determines the quality of the entire film.
After talking about the difference between primer and topcoat, let's take a look at how the primer and topcoat should be used. Primers and topcoats are both latex paints and usually require a combination of the two. When painting the wall, it is usually necessary to brush the primer after the putty is completely dried. Usually the primer needs to be brushed twice. Because the wall has a large paint surface, the primer is adjusted. It is necessary to add some water moderately, so that the primer can be evenly applied. When the topcoat is painted, it is generally required to be painted three times on the wall, and it cannot add too much water like the primer because Adding too much water will affect the feel, thickness and hardness of the paint film. Therefore, it is only necessary to add a little water to the last pass when brushing the finish.
1. Iron red cathode electrophoresis primer: This paint film has good adhesion and corrosion resistance, superior to anodic electrophoretic primer, suitable for primer of metal parts, especially suitable for primer of steel products. .
2. New metal anticorrosive primer: The paint has fast drying, strong adhesion, good mechanical properties, and good oil resistance, rust resistance and corrosion resistance. It is mainly used for the bottom coating of various automobile bodies, compartments and parts.
3. Phosphating Primer: Primer for the essence substrate.
4, amino alkyd two primer: for the intermediate layer coating. It is applied to the putty layer which has been primed and smoothed to fill the sand holes and lines of the putty layer.
5, the new wood closure primer: suitable for wood closure primer, decoration and architectural coatings.
6, a new metal primer: for the metal surface of the base.
7. New zinc-rich primer: used in the underwater metal surface coating of shipyards and chemical anti-corrosion metal base.
8. Iron red alkyd resin primer: used to coat steel surface with a relatively uniform rust layer.
9. Rubber Alkyd Primer: Brushed or sprayed onto the treated metal surface.
10, zinc yellow polyurethane primer: suitable for the bottom coating of railways, bridges and various metal equipment.
11. Acrylic/epoxy primer: It has good salt spray resistance, moist heat resistance and good mechanical properties. It has good adhesion to metal surfaces and can be used as an excellent anti-rust primer.
12. New polyphenol oxygen precoat primer: used in machinery, equipment, shipbuilding and other industries.
13, epoxy grease color primer: suitable for coating light metal surface.
14. New asphalt ship primer: It is suitable for bottoming of the underwater part of the ship. It can also be used as the insulation layer between the aluminum powder asphalt ship primer and the asphalt anti-fouling paint.
The difference between the primer and the topcoat and related knowledge are introduced here first. I hope that these introductions will be renovated soon! If you need to know more, please visit the decoration home decoration network for attention!
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