Was hoping to get some opinions concerning the design of panels and sealing of wood using polyurethane or a similar material. Specifically, if one were to apply several coats of polyurethane, would expansion and contraction due to humidity changes be an issue? I understand that over time as the original coating wore off, the panels would have to be re-coated but for things like cabinet doors, I'm guessing that may only be once in 5 to 10 years if that. I’m just curious and trying to gain a little knowledge. Appreciate your thoughts and input.