My spouse is a molding maven. We gave her a miter saw for Mother's Day, many years before I got a table saw.
I just asked, and she reminded me that all she does is nail the molding to the walls. She uses very small finish nails. She pre-paints the molding, then touches up the nail holes after they are installed.
I don't remember how many years ago she did the work in the photos, but it was a long time ago. We have never had problems, despite the lack of glue or anything else. The same is true for other moldings - crown molding, chair rails, etc.
P.S. When we (my spouse) did the original work, the molding fit around the electrical outlet in the short hallway. Later on, we bought one of those electrical outlets with the three LEDs that light the floor at night. The frame blocked the LEDs, so I used a coping saw to cut the gap in the frame so that the LEDs could illuminate the floor.
Last edited by Tool Agnostic; 09-14-2018 at 12:22 PM.