Do I have to sand the 2K Urethane Primer Surfacer?
While this primer is super easy to sand smooth, you may shoot the Single-Stage Urethane Paint over it in a “wet on wet” application. That means the paint may be applied over fresh primer that has still not cured. Just wait until the primer has flashed before applying paint. Doing this provides superior intercoat adhesion, with a chemical bond holding the primer and paint together, as opposed to a mechanical bond resulting from scuff sanding.
