Star Mineral 442 (55 Gal Drum) was originally developed for highway bridge decks where deicing salts can cause deterioration and rebar corrosion. This versatile formula reduces chloride penetration, water intrusion, scaling, freeze-thaw damage, staining and efflorescing salts. Star Mineral 442 penetrates and reacts to become a permanent part of the concrete, so it doesn't peel or wear off.