I have a couple of queries. Firstly, will a coat of shellac (namely a light sealer coat) stop / reduce the penetration of oil (BLO for example) from penetrating the wood effectively. I have attempted to find a definitive answer on this but the internet contradicts itself as it often does.
Secondly, I am making an oak tool chest (oak chosen for a couple of reasons that don’t need to be discussed) however the tannins in the oak react with some metals of which most of my tools are made of in an undesirable way. Will a surface finish such as shellac create a good enough barrier to stop this or would I need to use poly or line some of the surfaces with material?