I'm gonna do a uds build this spring. I have barrels but they are food grade and have the red liner. This thread has me worried about how to get the inner paint off it, but the barrel only cost me a couple bucks so hopefully I don't regret it.
I build them out of lithium grease drums from the local tractor-trailer oil change place. The grease is inside a plastic bag inside the drum so the drum is basically clean and new, the only grease on it is stuck to the underside of the lid.
i've looked up the MSDS on the grease and it is just mineral oil and soap, with limited health concerns. None the less, I still power wash them, burn them out with pallets and power wash again.
The pork loin with rub (I used maple syrup on the loin before the rub) and the baked beans were both amazing. Both were big hits.
IMHO, paint, epoxy coating, motor oil, they're all relatively the same for health concern. Hot equal bad, because they can off-gas nasty chemicals. But you can use that to your advantage, heat makes them off-gas nasty chemicals. IE, get them hot enough and all the nasty stuff disappears. I would MUCH rather burn off a film of residual motor oil (unused) on a non-food-grade barrel over trying to burn off the epoxy coating on a food-grade barrel. Once that epoxy coating is gone the magical "food-grade" is completely moot. Afterall, both are made of steel (likely the exact same steel) and both are releasing nasty chemicals when burned, one just does so much more cleanly. Wipe the drum out, light big fire in drum, oil will burn out leaving carbon behind. Brush carbon out, make tasty meat.most had contained motor oil or antifreeze with no plastic bags. Just not worth messing with, in my opinion.
If it was me, I'd call around and get a quote on having it sand blasted. I mean I'm pretty dang cheap and definitely the DIY type, but I had no interest in tackling a red liner.
I'm doing an experiment tonight. Trying to use my 18" kettle grill as a smoker. Have some chicken leg quarters on now, so far so good!
That's easy with chicken. Might need to keep the intake choked a bit. Good luck, share pics!