The Oil That Creeps and Loosens Frozen Metal Parts.A scientific principle reduces the surface tension so that this amazing solvent creeps into openings as small as one millionth of an inch. Aerokroil is the aerosol version of Kroil that loosens frozen metal joints in minutes. Dissolves gum, dried grease, and oil -- without attacking the metal. Displaces water, provides lubrication and prevents rust.