As a child, you probably heard your mother telling you not to buy a food can that was dented. She was right! In order to protect food from coming into contact with metal, food cans used to be coated internally with a phenolic lining. This lining was brittle and if the can was dented, it was likely that the interior lining had cracked. Today, linings offer the chemical protection of the phenolic plus they are mixed with the flexible properties of epoxy. Together, these epoxy/phenolic coatings are chemically resistant and able to adhere to a surface when it is damaged. While the epoxy/phenolic is a sprayed-on and cured coating (like paint) a passive rust inhibitor is applied to all our carbon steel drums in order to remove surface oil prior to painting. The rust inhibitor is much like the final rinse at a carwash, it is a light clear spray that is neither visible or measurable once it is applied. The purpose of the rust inhibitor is to prevent flash rust on uncoated carbon steel. If a customer needs an epoxy/phenolic lined drum for chemical or long-term rust resistance, then an unlined drum will not suffice. Please contact me, or your sales representative, if you have questions about our lining options.