Purpose and Specifications

The WD-40 WD-403/S Universal Lubricant is your go-to 420ml aerosol can for tackling stuck parts, rust, squeaks, and moisture in cars, homes, and workshops. This premium WD-40 formula penetrates tight spaces to free rusted bolts, lubricate hinges, chains, and gears, while protecting metal from corrosion. It works in temperatures from -23°C to 93°C, displaces water from flooded engines or tools, and cleans grease without damaging paint.

• Volume: 420ml – perfect for everyday mechanic jobs
• Weight: 0.46kg – lightweight and easy to store
• Shelf life: Up to 2 years unopened, indefinite once opened if kept cool and dry
• Coverage: One can treats multiple jobs, like dozens of hinges or bike chains

When to Use / Replace?

Spray WD-40 on squeaky door hinges, seized nuts after 50,000+ km of road grime, or rusty tools left outside for months. Use it monthly on garage door tracks or bike chains to prevent wear, or after rain to dry spark plugs and start engines fast. Reapply every 3-6 months on exposed metal for lasting rust protection – it won't attract dirt like heavy greases. Avoid on plastics like polycarbonate.

FAQ

Q: Can WD-40 fix a flooded car engine?
A: Yes, spray into the carburetor or spark plugs to displace water and get your engine running again quickly.

Q: Is it safe for my bike chain?
A: Absolutely – it lubricates smoothly, cleans debris, and protects against rust without gumming up.

Q: How long does rust protection last?
A: Provides protection for months on tools and parts, even in humid garages; reapply as needed.