Another Mopar Off My Bucket List - Barracuda Fastback

These are listed as mandrel bent. It's not a kit so instructions won't be a concern. Do they coat them in oil or something?
It seemed ,like it... Some kind of oil,was on them on tack weld... Wiped pipes down,welding was more friendly (cheapo flux core H.F.110 welder)..I would still wash ,wipe with a good solvent.