Finishing query - insides of free-standing cabinets?
I'm building a buffet (yes, yes, pictures and more to come later on, I promise!), but I have a question about the finishing.
I'm going to use clear water-based poly on the exterior as it's to match the table I built a little while ago, but I saw an article that talked about cabinets and not putting finish on the insides, and this being a recommendation. Can't remember the magazine, but it was a woodwork one.
This seems strange to me, as I naturally assumed I should give it at least 1 coat to help keep the "open faces" balanced in regards moisture absorption. Given NSW has a humid climate at times, and also given this is an inside only piece, I'm a little confused.
What do you all do usually? Do you seal the inside of a buffet or similar cabinet? Or do you leave the timber raw?
And does using poly etc. only on the one side cause issues with warping?
I certainly know if I get water on one side of a piece of pine it bows, or at least the piece I used under my sharpening stones did, as it only got wet on one face.
The buffet will have two cupboards side by side, no divider, and a set of 3 drawers at one end. Primary construction is glue-laminated beech boards, with a marine-ply back (probably the nearest to good beech ply in the US).