I have a barrel that has been used exclusively for kit wines for a number of years. I don't do too many red kits anymore and have plenty of barrel space for my grape wines. So I'm thinking about taking this barrel out of the rotation and turning it into an end table of sorts for the patio (OK, just a little something to set my drink on). I'd like to clean it up on the outside to get several years of stains off of it first. Then, clean up the inside and do something to prevent rot, mold, etc. Ultimately, I'd like to apply some polyurethane to seal it up. Any advice for this not so handy man?