Car primer is a coating that is directly sprayed on exposed sheet metal surfaces, including sheet metal phosphating, electrophoretic coating, and primer filling. It is a full car primer that requires excellent adhesion to the substrate, as well as excellent rust prevention, corrosion resistance, oil resistance, and other characteristics. What are its functions and requirements? Let's take a look together.

1、 The role of primer

Primer is a type of paint that is usually applied directly to the surface of an object or putty. Its function is to avoid oxidation and corrosion of metal surfaces, and to improve the adhesion between metal surfaces and putty, as well as between putty and topcoat.

A suitable primer is a durable and beautiful condition for the topcoat. Assuming that the primer is poor, the appearance of the topcoat will be affected, even showing cracks or falling off.

After removing the rust and rust on the old paint film board, it is assumed that a small area of paint can directly scrape putty on the exposed metal surface, then seal one or two components on the primer, and then spray it to completion.

But assuming a large area of paint is to avoid directly applying putty on the bare metal substrate and using a single component primer, the correct approach is to use a phosphating primer or epoxy primer, then apply putty, and then seal the two components with the primer. Durable, corrosion-resistant, and surface treatment coating.

During the correction process, the primer and topcoat can be directly sprayed onto the electrophoretic primer. Some accessories are coated with general maintenance primer. Although the primer does not have the adhesion and durability of electrophoretic primer, it can also ensure that the steel does not rust within the specified time. This protective primer is usually sanded before applying the correction coating.

2、 Requirements for primer

1. The surface of the workpiece should have excellent adhesion after surface treatment, and the formed primer film should have excellent mechanical strength.

2. The primer itself needs to be a corrosion inhibitor, and the primer coating needs to have excellent corrosion resistance, water resistance, and chemical reagent resistance.

3. Excellent compatibility with intermediate or topcoat coatings.

4. Being able to adapt to the characteristics of car painting process in many water production, the primer should have excellent construction performance.

Article source: Qingyuan Automotive Repair Painthttp://www.jinliangxincai.com