My wife likes shiny stuff, Pottz. Don't know why she married me, I'm pretty dull. I personally think she should put a runner on it like she was originally saying. She quilts, it needs a runner...win-win!

Nathan, the concave side is the top, which is varnished. I could sand it off and do the wetting, but I'd have to reverse 150 years of pressure in less time. Getting the top off shouldn't be too difficult, as it was nailed on instead of having cleats like "nice" furniture. The sag isn't all that obvious, but I suspect that if it was shiny that observation would change. Probably ought to try it, since I have another ready solution. It will end up on the north wall of the family room, so will never see direct sun. Such being the case, maybe the sag will never show? The only natural light comes through the sliding glass door on that north wall. Wife is leaning on me to not spend more than it cost us, and I think that a sheet of good enough white oak plywood will be bumping that cost, since a sheet of crap oak from Lowe's is $100 already. If I go this way (new plywood), the cost of the finish is simply incidental, since it needs refinishing anyway.

Alternatively, I could just do an update on the finish, using the stuff Nathan already posted. The only parts needing to be nice enough for the wife would be around the edges, then. I bought this thing cheap because I really liked the carving details. Who'd'a thunk it would be this complicated? 🤷‍♂️

Steven- Random Orbital Nailer