Using 100-grit sandpaper, lightly sand any raised or rough areas.
Using a caulking gun, apply a thin layer of painter's grade caulking to the gap or seam.
Immediately following the repair, wipe off any excess caulking with a damp rag or a putty knife.
Allow the area to dry.
Caulking (Painter's Grade)
Sandpaper (100 Grit)