Finish Line's Chill Zone works like magic to loosen and free rusted parts! Before discarding your rusted chain or giving up on a frozen crank bolt, a sticky derailleur, or a seized seatpost, give Chill Zone a shot. Bike parts that normally need to be replaced can be reconditioned to ride another day. Chill Zone has a special refrigerant that freezes metal as low as -50°F/-45°C contracting it and breaking the rust bond. Then Chill Zone's penetrant breaks down and flushes out the rust. With Chill Zone, most rusted parts quickly regain full functionality. Plus, it lubricates, too, so you don't need to add any.