You might be wondering if it’s possible to correct a door or maybe a door frame that has warped in a particular area. Well, the answer is that you can improve your door or frame’s condition and stop the problem from spreading further, but you can’t undo the warping.
This Old House says that while nothing can permanently reverse the warping, you can help improve the situation by removing your door and finishing it with a paint or polyurethane. This will help stop the moisture from spreading, which, if left unchecked, can eventually warp your entire door.
Read the full article here.