The original primer of a car is a coating directly sprayed on the exposed surface of the sheet metal, including sheet metal phosphating, electrophoretic coating, and intermediate primer filling. It is the bottom layer of the entire car paint and requires excellent adhesion to the substrate, as well as good rust and corrosion resistance, oil resistance, and other characteristics.

When the paint on the exterior of a car is damaged, it is necessary to determine whether the car primer is damaged. If so, it is necessary to repair and spray paint in a timely manner to avoid rusting and corrosion of the sheet metal. Nowadays, repairing car paint may be innovative. The filling of pits is usually done with atomic ash and then sprayed with primer.

The four main functions of car primer spraying: 1. To avoid sheet metal corrosion,; 2. Generally, primers have filling properties and can fill hidden pits and pinholes; 3. Spraying primer can be considered as providing good adhesion ability for the previous layer of paint film; 4. Block the impact of old paint layers or primers on the surface paint. Avoid the gloss of the topcoat being absorbed by the substrate. The varieties of primers include plastic primer, phosphating primer, epoxy primer, Suash primer, 2K intermediate primer, atomic gray, etc.

Plastic primer mainly acts on plastic substrates, such as car bumpers, and can add adhesion between the paint film and the plastic substrate, as well as the decorative effect of adding topcoat. Plastic primer does not need to be mixed with paint materials, and can be directly sprayed using air spraying (i.e. spray gun), with thin spraying to avoid affecting adhesion due to excessive spraying thickness.

Plastic primer

Phosphating primer is generally used during the production of sedans. Its paint film is firmly attached to the metal surface, and the mixing ratio is generally 4 to 1, which is 4 parts of the primer and 1 part of the phosphating solution. Air spraying is used, and the paint film thickness is 80-120um.

Epoxy primer: It is commonly used in industry. When the car sheet metal is severely exposed, rust removal is required before spraying epoxy primer to prevent rust and corrosion. The use of epoxy primer requires the addition of epoxy curing agent and epoxy diluent, with a mixing ratio of 4:1 to 0.3. Air spraying is used, and 2-3 layers are wet sprayed.

Epoxy primer

Suhuishi: One component intermediate primer is used to close and fill the sand holes in the substrate. It has a fast drying speed and does not require curing agents. The mixing ratio with the diluent is 1:1. Due to its fast drying speed, it is only suitable for repairing and spraying parts of sedans, and is not suitable for large-scale spraying construction.

2K intermediate primer: Compared to Suash primer, it has superior filling function, stronger covering power, enhanced weather resistance and stone impact resistance of the paint film, improved gloss and fullness of the topcoat, and better light and color retention than Suash primer. It needs to be used together with 2K intermediate primer curing agent, with a mixing ratio of 4 to 1, and air spraying for 2 to 3 layers.

Intermediate primer

Atomic ash is also classified as a type of car primer. Generally, the repair process for car paint includes epoxy primer, atomic ash, intermediate primer, base paint layer, and clear paint layer. He is mainly used to fill in the sunken areas of car maintenance and fill in large areas after car sheet metal. The mixing ratio with curing agent is generally 100g to 3g.

Article source: Qingyuan Automobile Repair Paint Manufacturer http://www.jinliangxincai.com/