The original primer for sedans is the first coating directly sprayed on exposed sheet metal surfaces, 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 outstanding rust and corrosion resistance, oil resistance, and other characteristics.

When the paint on the surface 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 prevent rusting and corrosion of the sheet metal. Now, when repairing car paint or renovating car paint, the pit filling is usually done with atomic ash, and then sprayed with primer.

The four main effects of car primer spraying: 1. Preventing sheet metal corrosion,; 2. Generally, primers have filling properties and can fill hidden pits and pinholes; 3. Spraying primer can provide outstanding adhesion ability for the previous layer of paint film; 4. Isolate the impact of old paint layers or primers on the surface paint. Prevent the gloss of the topcoat from 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 is mainly applied to plastic substrates, such as car bumpers, which can add adhesion between the paint film and the plastic substrate, increase the fullness of the topcoat, and enhance the decorative effect of the topcoat. Plastic primer does not require mixing of paint materials, and can be directly sprayed using air spraying (i.e. spray gun), with thin spraying to prevent excessive spraying from affecting adhesion.

Plastic primer

Phosphating primer is generally used in the production of sedans, with a strong film attached to the metal surface. 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 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 and epoxy primer is sprayed to achieve rust prevention and corrosion prevention. When using epoxy primer, epoxy curing agent and epoxy diluent are required, with a mixing ratio of 4:1 to 0.3. Air spraying is used, and 2-3 layers are wet sprayed.

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