I have just finished building my pantry. It has a door made of painted MDF that is 40x195. Now, after a couple of weeks, it is starting to look a bit like a banana. The upper and lower corners are bending outward. I guess it's because the air in the pantry is a bit humid since there's a vent in there.

Yesterday, I tried attaching a couple of magnetic locks, but they weren't strong enough to pull in the corners sufficiently. So now I'm thinking of bracing the door from the inside somehow. Maybe an L-profile in aluminum that I screw along the front edge?

I have a couple of similar doors on another cabinet (without a fresh air vent) and they are still flat. So I don't think filing a complaint is an option. It will just happen again.

Any other tips for a solution?
 
Have you painted it on both sides? If it is only painted on one side, that might be the reason it warps.
 
It is painted from the factory on both sides.
 
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