Re: Floating Barrel
If it were me, I would use Min Wax sanding sealer to seal the grain. Then get the Helmsman outdoor polyurethane. I have used it to do finish work on out door trim on an all season deck. Works great for keeping water out. If you sand between coats it will finish up real glossy and smooth. Just my .02.
"Enter through the narrow gate. For wide is the gate and broad is the road that leads to destruction, and many enter through it.  But small is the gate and narrow the road that leads to life, and only a few find it.
If you find your self in a fair fight, your tactics suck!- Marine 1st Sergeant Jim Ryfinger
Friends don't let friends develop canonitis!
arguing over the internet is like the special Olympics....even if you win, you are still...special!