Rost Flash Pro is twice as effective against rust. A refrigerant freezes the sprayed surface, thereby breaking apart the rust and dirt structure. This crack effect allows the penetrating oil to quickly and deeply penetrate, making it easy to loosen stuck screws, bolts, or sliders. Rost Flash Pro is free from silicone, resin, and acids, and it prevents future rust formation. Rost Flash Pro quickly and non-destructively loosens rusted screws, bolts, fasteners, and mounting parts of all kinds.