The "rust" looking spots look dreaded red/pink lining on some food grade drums. I have one out in the back yard and it is the same shade of pink. Are the spots really smooth or rough?
Cookshack sm055, UDS, Smokey Joe, Southwest Pit, couple of Weber kettles, an old gasser, and a weed burner.
Gary, KCBS -CBJ
Certified Nebraska MOINK Baller, KCBS - CBJ
Semper Fi, when in doubt empty the magazine