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Is that something which happens?
Any time you strip wood you allow it to absorb moisture which can potentially lead to movement.
Also if you left it leaning between the top and bottom gravity could help it decide to bow, especially if it's been like that for a while.
Finally if you sanded particularly vigorously (or applied too much pressure with a sander) and the wood had a high moisture content you could generate enough heat to soften then lignan in the timber and effectively steam bent it.
Bobbo
@rhowe
After sanding and repainting some wooden louvred wardrobe doors, one of them seems to have warped. Is that something which happens?
I had them leaning against a wall when I painted - I wonder if maybe one of them was a bit skewed or something.
I used solvent-based primer and the solvent-based Dulux satinwood - waterbased would have dried far too fast for me to keep up with such a fiddly job.