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 a [...] 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 long-lasting effect of the dried primer, the primer application and the bonding process can generally be carried out independently at different times. Depending
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