Primer / Clearcoat
The primer in a powder coating serves as an adhesion base for the powder-coated layer. It improves the adhesion of the powder coating to the substrate and increases the corrosion resistance. In addition, the primer can pre-treat the substrate to provide a uniform surface coating. Clear coats form a protective and sealing layer and are used to protect the object from damage, wear and corrosion.
There are different types of primers suitable for different requirements and substrates. Some commonly used primers are epoxy primers, polyester/epoxy primers, additional zinc phosphate primers and phosphate primers. Choosing the right primer depends on factors such as the substrate material, environmental conditions and the desired finish.
Clear coats are usually made of polyurethane, epoxy resins or acrylic resins. The type of clearcoat depends on the specific surface coating requirements, such as durability, UV resistance and scratch resistance. The clear coat in powder coating serves as a protective layer and can also improve gloss and color intensity. A good clear coat layer can also provide longer life and better weather resistance. The choice of clearcoat formulation depends on the application and the requirements of the part, including surface finish, durability, and resistance to chemicals and weathering.