I'm posting this inquiry for a friend of mine that covers tables. He recently worked on an 8' Olhausen with three piece 7/8" slate. The owner told him after he was well into the job that the slate had gotten wet. The particle board attached to the slate got wet and absorbed water and is now no longer level. The question is, can this slate be repaired, maybe by attaching new particle board to it? I told my friend I would post here for him, so any advice is appreciated. Thanks.