Hi.......this is the way I do it.........This method works better on a piece that has been stripped. You can try it either way.........also works best in the summer on the driveway when it's hot, hot, hot...........
Remove leaf and all hardware
Place wet towel on driveway
Place leaf or warped board convex side up on wet towel
Place dry towel on top of leaf board for protection
Place heavy weight distributed throughout the leaf. Sometimes I will place boards on top of the dry towel then distribute weight, depending on the size of the warped board.
By weight I mean a lot but not so much you crack the board. Concrete blocks etc.........
Sometimes takes 2-3 days......check often........the hotter the day the better this works.
As soon as the warp has been taken care of, immediately sand, stain and finish both sides of the leaf. Your trying to remove moisture from one side and put it on the other side.
If you not refinishing the leaf I would still put a finish coat on the underside to keep it from further warping.......good luck.......
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best............... ........Tim
I have gotten that dreaded furniture disease. That's when your chest is falling into your drawers!