Hammer the paint can lid down.
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Here are the long boards primed on both sides. Learning to clean that paintbrush well really makes it a pleasure to lay down multiple coats while saving the brush.
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I might lay that front board on the wall tomorrow before the second coat. If is is a bit too long I can trim it down and just continue to paint it. It's not a killer if the boards are a little short, I have silicone caulk to fill the gaps. I also have some wood putty to fill in gaps in the corners. After I get all that done for all three walls, I will put a final coat of color on the walls, and they should last for decades. A day each for 2nd primer, 1st color and 2nd color. It's a nice Southern tempo. The wall was rotted for a decade, so a few more days will be fine.