I'm building a 3-shelf hanging wall unit w/ beadboard backing for my bathroom. Similar to this stock photo:
It will be painted - rollers and foam brushes. I do not have the equipment to spray unless it's from a rattle can. Assembly is home store Pine, dadoes, Gorilla wood glue, and brad nails.
I'm worried about humidity and wood movement. The room is small and steams up very easily. Obviously, all "exterior" parts will be painted, but should I paint the back of the bead board also? Should I paint the back of the shelves before applying the bead board? Is there any particular type of paint that will seal it best w/ a semi-gloss finish?