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Warped table top

Thanks everyone for the suggestions. I’ll let you know how it goes.

You are on track.  But I would add...
Sand the side that is cupped up and lightly wet it.  Place cup and wet side down on flat surface, weight the top.  Not much weight just enough to create tension.  Check frequently for progress.  Measure the gap first and each time to see if it works.  When it's flat or close enough for you flip it wet side up and put weights on the ends.
Good luck.
  

If the table top sat on a flat surface for an extended period of time with airflow only in one face, the top couldn’t breathe and warped. It’s imperative to have airflow on both sides, and for both sides to be finished similarly. 

There are ways with water and sunlight to try to correct the warpage.  Worth a Google. 

Phil, I would bite the bullet and run it through a planer or use a hand held planer and redo. I know it’s hard to swallow but a whole lot easier and will produce a better result.

Where is the actual warp/cup/bow? If it is the resin of the river, you could probably flatten it out by clamping it to a very flat table or counter and then very gently heating the resin with a heat gun or hair dryer. Or even in a warm oven. If the actual wood it warped or cupped, that seems like a bigger issue to deal with.


I was just generally thinking if the original piece got bowed from an air duct or the sunshine heating up the resin, it would be a much easier fix.

Phil
Not sure if your plan will work but I had a question.
Are both sides of the top finished in the same way?
If not that can contribute to the warping as well.
Jeff


I’ve been making a small river table (29” D). The top has been finished with Rubio monocoat. It sat for several weeks (maybe 4-6 weeks) on a card table that sagged in the middle. As you might expect, since it was a horizontal surface, I used it to stack things on and I honestly didn’t think about it. Last week I was finishing up the base of the table and noticed it had bowed a little bit, about 3/16” at its center. The bowing appears to some what follow the resin river join with the wood on one side if the river

Okay here is what I am wondering. If I were to sand it back down to bare wood, place the top on a flat surface so bowed center is up, place a moderate amount of weight on it, warm up the area with a heat lamp ( not to close your catch fire just enough to warm it up and place a humidifier in the area (wood is very dry), would that maybe flatten the table top?

sorry for the long blurb but had to adequately describe the situation.

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