[masraum]

Originally Posted by rockfan4

Take it down. Use a table saw to either cut the tongue narrower or the groove wider so that it lies flat. Put it back up. I hope you didn't glue it to the wall.

I think using a handheld planer would just make it worse.

Not glued. Just nailed with brads. I don't think trying to fix the tongues and grooves would work. I also don't currently have a table saw. Maybe with a router table and TnG bits, but I don't have one of those either. If it was the floor, I'd possibly just use my belt sander, but I'd discovered that trying to use a belt sander on a wall is a real b1tch.

I'm pretty sure that i could get it good enough to make her happy with a hand plane, but not in the time that we have (and frankly I don't want to do that much hand planing, at least not with the pressure on to get finished in a short time)