DanpalI was able to straighten the top of a 5 drawer maple dresser that was pretty warped when I was refinishing it. What I did was to add moisture to the concave side by placing a damp towel over it. This actually worked well and the dresser came out nice.
OkNo, I didn't clamp it. I just check on it fairly frequently until it straightened on it's own. I then made sure to seal both sides so it wouldn't happen again.
Only so much space available!You need a pinball machine in your basement
Your results may be different than mine. Clamping flat wasn't enough. (Some warpage returned).I have a board that came with my boat that has the same issue. It is partially sealed from previously owner. I was planning to strip it completely, soak it overnight in a bathtub, and clamp it flat the next day on my workbench and see what happened. Nothing to lose at this point. If it worked I was planning on starting the refinish asap. If anyone has tried this approach I would love to know their results.