If there is no finish on it, I wouldn't put any on it. Scrape the stickers off, quick sanding, there you go. The fewer 'adjuncts' you add to the mash, the better.
"Beer, well respected and rightly consumed, can be a gift of God. It is one of his mysteries, which it was his delight to conceal and the glory of kings to search out."
The Search for God and Guinness by Stephen Mansfield