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If you are going to buy the kit, wait to do your burn until you get the kit. Then drill all the holes the directions say you need for installation. Then do your burn out, then repaint the exterior with high temp paint (yes the exterior paint will come off too.) Then mount all the hardware.
leave it and do this build your drum and fire box then after your drum is ready to cook this is what i do i find fruit wood then i put about 3lbs of birquets in start it then cut all your fruit wood into about 6 '' pieces load it up set temp to about 225 and let it burn for about a day then on second day do the same thing again but stop at butcher and get a bunch of fat and or cheap fatty meat after fire is going to temp 225 add meat the fat drips into coals and sticks to smoker walls lid creating a thick protective cake on smoker walls .
after two days of 24 hr smoke or 48 hrs when you look in drum the whole drum will have a thick cake on walls at this point your drum is seasoned and ready to use i quit burning drums because they rust out quicker good luck granddad
You are right it is food grade all bbq have a 1/4 inch of black cake or soot juice in my drum I never cook over 275 degrees so no problem low and slow and yes I have used unlined drums in the past if it works for you great good luck happy smokeing