I'm in the process of preparing a pine wooden box to hold a large number of cardboard wallets for storing a card game collection, but there appears to be some oil or something like it inside the wood itself. When i have left some paper inside the box, it has gone slightly waxy and translucent.
I am worried that leaving the cardboard wallets and the cards that will go inside them will also cause some damage to them. I was considering varnishing the box myself anyway, and was wondering if anyone knew if this would prevent any damage to the contents like I've described?
The box was made for me as a gift by my brother, and is made out of pine.