Finishing primer

coatingwater-based

Primer (Water-based, Solvent-based), Wash Primer Primer, also called adhesion promoter or chemical bridges, function as a bonding layer between the substrate and the adhesive, and improve the adhesion. They are used mainly on surfaces which are difficult to bond or in applications with very high demands regarding resistance against moisture and heat. Many Jowat primers contain highly dispersed silica acid which expands the surface and facilitates a permanent bond. Applying an primer which is compatible with the specific adhesive is often the most suitable or the only method to achieve an optimum adhesion to the substrate. In addition, the primer may also function as a barrier protecting the surface against infiltration of water or other external elements, and therefore significantly increase the ageing resistance and permanent tack of the surface finishing. Primers are usually applied in a thin film to ensure a proper drying of the coating. Due to the long-lasting effect of the dried primer, the primer application and the bonding process can generally be carried out independently at different times. Depending on the material, some substrates may require an “oxidative pretreatment” before the primer is applied. Adhesion to the substrate and the cohesion of the primer film can be improved by mixing the primer with a crosslinking agent. For some materials (e.g. PP), it is absolutely necessary to add a crosslinking agent. Primer provide the following benefits: universal use of adhesives adhesion to the most different materials permanent bonds to meet the strictest requirements frequently, preserving the surface pretreatment