I just finished this project. It’s my second painting project with my own business. I cleaned it with Krud Kutter and then sanded it with 80 grit sand paper. I then Primed it and sprayed it with Super Paint flat. I originally planned on brushing and rolling it but because of the tongue and groove board it was taking forever to brush in between all of them. I switched to a Graco Sprayer and I was really happy with how it turned out! I definitely could have tarped off better but I’ll know for next time.