CRC ZINC IT is a single component zinc rich compound with a special epoxy binder and contains 93% of the highest pAPPLICATIONS: Recommended for use on structural steel, trailers, roofs, guard rails, welding seams, rivet holes, fencing, storage tank transformers, power generation equipment, off shore oil rigs, ships, railroad equipment, substation equipment, transmission towers, touch up over galvanized coatings, coastal and ship borne installations subject to severe salt water and salt spray corrosion.urity zinc in the dried film, to give galvanic rust prevention.