Best Penetrating Oil to Free Frozen Fittings, Fasteners, and Bolted Assemblies A high-quality, fast-acting, penetrating oil that reaches inaccessible areas and frees frozen nuts, bolts, and fittings without damaging the base metal.Chesterton 706 Rustsolvo® is worker friendly, low odor, plastic, and paint safe. Contains no aggressive solvents, ketones, aromatics, alcohols or chlorinated solvents.NOTE: Use Chesterton's 601 Chain Drive Pin Bushing Lubricant when light lubrication is required, and Chesterton 775 Moisture Shield as a moisture displacing corrosion-inhibiting coating. Chesterton Sprasolvo is the same fast-acting penetrating oil in aerosol form