A high-performance penetrating catalyst formulated to quickly break free rusted or frozen parts caused by rust, corrosion, and buildup. Trusted since 1957, it has become the #1-selling penetrant thanks to its ability to work fast and deliver lasting results in tough applications. The powerful formula penetrates deep into crevices, threads, and seams to loosen stuck components without excessive force, saving time and reducing equipment damage. In addition to freeing parts, it contains a non-evaporating lubricant that continues to protect surfaces after use, preventing further rust and corrosion while keeping equipment running smoothly. Safe for use across a wide range of applications, it is effective on automotive, industrial, marine, plumbing, and general maintenance equipment. Packaged in a convenient 11oz aerosol can, it offers precise application and long-term reliability.