How to un-warp MFT table top?

[Ross 71]

Well I guess the title tells the story. I thought I'd stored my MFT in the dry, but the damp has got to it. There's a 1/4" hump across the middle of the tabletop. What can I do? And also, what should I have done to prevent this. Sealer coat, maybe?
This winter has been wet and wet, the air is very damp, but that's England for you, so how can I stop this happening again.

 

[duc996]

If it’s only a 1/4” hump then I would just sand it flat. I actually sprayed oil base polyurethane on mine and it has been great. I also have my MFT placed in my garage. HTH.

 

[nclemmons]

You might reverse the top and make some braces under the bottom to bring it back to level if you can spring the top.  At 3/4" it might give you the flex you need.  But given you have holes across the table, you should be able to glue a board between a row of holes underneath as an option and clamp it down while the glue sets.

Alternatively, buy a piece of lightweight MDF and a 20mm bit and copy that top to a replacement.