Ackley, been leaving natural. It leaves options if any grease were to surface later. But sealing is a rattle can away.
TheKid, ranch supply store had a 15 gallon black soft rubber like horse water bucket. I had 3 tank heaters in it. It fit an elk and a mule deer at same time. On the bears, be careful on having teeth fallout and get lost in the sludge. Not sure how you get around that on the bears.
