Thanks to everyone for the great info! I was just concerned with any left over rust after sanding the inside of the barrel, but I will not paint it. However, are there any recommended brands of paint for the outside of the barrel? My idea with the offset heat source was that I have been smoking stuff on a grill so far, and really want to try a smoker that has total indirect heat, rather than a burner being right near by. Great to know about that 18" weber as well.