Penetrant spray Wd-40 WD-40 103 400 ml aerosol – multi-purpose lubricant and rust penetrant

Wd-40 penetrant spray (WD-40 103) in a 400 ml aerosol is a multi-purpose lubricant and rust penetrant formulated to free seized screws, bolts and other corroded fasteners. The aerosol delivers a thin, low-viscosity fluid that displaces moisture, reduces friction and provides short-term protection against corrosion on metal surfaces. This spray is suitable for routine maintenance in automotive, household and workshop environments where access to tight or rusted parts requires a fast-penetrating solution.

Advantages

The penetrant spray combines rapid penetration with light lubrication, allowing stuck parts to be loosened without extensive force or disassembly. Its moisture-displacing action helps prevent electrical contact faults and inhibits further corrosion on treated surfaces. The aerosol format with a precision nozzle enables targeted application in confined areas, while the low-residue formulation leaves metal surfaces ready for subsequent mechanical work or longer-term lubricants.

Suitable for

• Freeing seized screws, nuts and bolts on vehicles and machinery
• Lubricating hinges, locks and moving metal parts around the home
• Displacing moisture from electrical contacts and connectors
• Preparing corroded fasteners for removal during repairs and maintenance

Key specifications

• Volume: 400 ml aerosol
• Function: rust penetration and light lubrication
• Application: targeted spray for tight or corroded parts
• Residue: low-residue formulation suitable for subsequent mechanical work
• Protection: short-term corrosion protection after application

How to use

Shake the can well before use. Hold the aerosol upright and apply a short spray directly onto the corroded or seized area, keeping a safe distance as indicated on the label. Allow the product to penetrate for a few minutes; repeat application if necessary. After loosening, wipe away excess residue and proceed with removal or mechanical adjustment. Use in a well-ventilated area and follow any safety instructions on the product packaging.

Usage recommendations

For best results, apply the spray in short bursts and allow time for penetration before attempting to turn or move the fastener. Protect surrounding painted or plastic surfaces from overspray and test compatibility on sensitive materials. After freeing parts, consider applying a heavier-duty lubricant or anti-corrosion treatment for long-term protection when appropriate.