What is the typical application process for primer sealers?

The typical application process for primer sealers involves applying them in multiple thin coats. This approach ensures that the primer adheres properly to the surface and provides an even and consistent finish. Thin coats can dry more rapidly and reduce the risk of running or sagging, which is especially important on vertical surfaces or intricate shapes. By building up the primer in layers, the substrate is often better sealed, enhancing adhesion for subsequent paint applications and improving the durability of the overall finish.

The other options do not align with standard practices. Spraying primer directly onto existing finishes without preparation might lead to adhesion issues and is not a recommended procedure, as proper surface preparation is crucial for effective sealing. Extensive sanding prior to application is typically not necessary for primer sealers, as they are designed to adhere well to properly cleaned surfaces. Lastly, mixing primer sealers with paint is not a standard procedure; they are intended to be used as a separate layer to create a proper foundation for the topcoat.