Started treating my 23 liter vadai last night. Checked this morning, after it was filled for about 20 hours and I noticed the outside was wet in one area. I just poured boiling water over it and refilled the barrel with hot water from the faucet. Hoping this will do the trick. Hate seeing that oaky water going down the drain. Btw: to you point, I've been using the wood bung while sealing. Should've been wrapped in separate plastic in your box? I have a drilled bung that fits. I'll add s type airlock and shop for solid bung eventually.