Penetrating Oil for Rust: The low surface tension formula penetrates deep into rusted threads and corroded joints, rapidly freeing seized bolts, nuts, and fixings where general-purpose sprays fail, the professional's choice from WD-40 Specialist.
Multi-Surface Rust Release: Loosens rusted hinges, stuck locks, and stiff chains while safe for use on metal, stainless steel, titanium, rubber, plastic, and PVC, performing reliably from -20°C to +90°C.
Lasting Corrosion Protection: Deposits a water-resistant barrier that delivers anti-rust and corrosion protection to guard bearings, pipes, conveyor belts, and exposed fixings against future build-up to extend service intervals between maintenance.
Professional-Grade Performance: Engineered for mechanics, engineers, and professionals who demand consistent results, this industrial-strength penetrating spray operates across a wide temperature range for workshop, garage, and field applications.
Precision Smart Straw Control: Reach tight spaces and awkward angles with the integrated Smart Straw for pinpoint accuracy, or flip down for broad coverage, the 360° valve enables spraying in any orientation, reducing product waste and time.
Specialist Maintenance System: Pre-clean with WD-40 Specialist Degreaser spray, apply Penetrant spray to free seized components, then protect with White Lithium Grease for lasting lubrication, or add Cutting Oil for drilling and metalwork.
WD-40 Specialist Penetrant is the professional-grade rust protection spray that frees seized components when general-purpose products fail. Engineered for mechanics, engineers, and tradespeople who cannot afford delays, this fast-acting rust remover for metal delivers rapid results on the toughest corroded fixings, frozen mechanisms, and stubborn fastenings. Apply as a preventative treatment to guard against future corrosion build-up and extend service intervals between maintenance. WD-40 Specialist Penetrant is part of a complete professional maintenance system designed to tackle every workshop task. Pre-clean heavily soiled components with WD-40 Specialist Degreaser Spray to remove grease, grime, and oil before penetrant application for optimal results. After freeing seized parts, protect metal-to-metal contact points with WD-40 Specialist White Lithium Grease for long-lasting, heavy-duty lubrication on gears, hinges, and automotive linkages. For clean, dry lubrication that won't attract dust, choose WD-40 Dry Lubricant, ideal for rubber, plastic, and metal surfaces requiring water-resistant protection. Complete precision metalwork with WD-40 Specialist Cutting Oil for drilling and machining tasks, maintain electrical systems with WD-40 Specialist Contact Cleaner for residue-free component cleaning, or apply WD-40 Specialist Spray Grease for non-drip, high-temperature lubrication on vertical surfaces and overhead applications.