Sprayon LU104 food grade penetrating oil aerosol is a synthetic, heavy duty rust penetrant that quickly penetrates nuts and bolts. Its accelerated action loosens rust while penetrating grease, dirt and corrosion.LU104 food grade penetrating oil is non-flammable and, like all Sprayon NSF H1 food grade lubricants, it has been specifically developed to meet the demands of today's food processing environments.