Hi everyone ! Complete newbie here but i joined to get expert advice. I have bought a English wallnut slice that i am making into a decorative sign for a  friend. I have done a little research about epoxy resin to hold the bark in place etc, but my main quetion is, as the piece is already ’kiln dried’ do i need to still soak it in preservative (as i’ve read) as a first task ? Many thanks for reading