Gasoila Free All actually has a rust eating agent in it to not only penetrate rust but to help desolve it. With Free All you use less force to loosen that rusted bolt so there is less chance of breaking it. Loosens red and white lead, tar, grease, carbon and graphite deposits. No more torching, drilling, hammering or chiseling. Specially formulated, rust eating agent is ideal for plumbing, automotive, marine and general industrial applications. Will free up all threaded pipe connections, rusted machine screws, bolts, nuts, clamps for mufflers and tail pipes, pillow blocks, universal joints, locks, etc. Contains NO silicones, making it safe in paint and shop environments.