---
product_id: 48736745
title: "WD-40 Specialist Penetrant Spray 400ml"
brand: "wd-40 specialist"
price: "$34.22"
currency: USD
in_stock: true
reviews_count: 8
category: "Wd 40 Specialist"
url: https://www.desertcart.us/products/48736745-wd-40-specialist-penetrant-spray-400ml
store_origin: US
region: United States of America
---

# precision Smart Straw control operates -20°C to +90°C 400ml industrial-strength spray WD-40 Specialist Penetrant Spray 400ml

**Brand:** wd-40 specialist
**Price:** $34.22
**Availability:** ✅ In Stock

## Summary

> 🛡️ Unlock Rust, Lock in Performance!

## Quick Answers

- **What is this?** WD-40 Specialist Penetrant Spray 400ml by wd-40 specialist
- **How much does it cost?** $34.22 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/48736745-wd-40-specialist-penetrant-spray-400ml)

## Best For

- wd-40 specialist enthusiasts

## Why This Product

- Trusted wd-40 specialist brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Smart Straw Precision:** Reach tight spots with pinpoint accuracy or broad spray coverage
- • **Multi-Material Mastery:** Safe on metal, titanium, rubber & plastic—versatility that works
- • **All-Weather Reliability:** Performs flawlessly from freezing cold to scorching heat
- • **Deep Rust Penetration Power:** Unlock seized bolts & nuts fast with pro-grade formula
- • **Long-Lasting Corrosion Shield:** Water-resistant barrier extends maintenance intervals

## Overview

WD-40 Specialist Penetrant Spray is a 400ml professional-grade rust penetrating oil designed to rapidly free rusted nuts, bolts, hinges, and locks. It features a low surface tension formula that penetrates deep into corroded joints, works safely on multiple materials, and operates effectively across a wide temperature range (-20°C to +90°C). The integrated Smart Straw allows precise application in hard-to-reach areas, while its water-resistant barrier provides lasting corrosion protection, making it the go-to choice for mechanics and engineers seeking reliable, industrial-strength maintenance.

## Description

This professional-grade penetrant spray frees stuck parts, removes rust, and provides long-lasting lubrication. Ideal for automotive, marine, and industrial use.

Review: WD40 - Some of the best oils - WD40 Penetration oil does the job on rusted nuts and bolts, it is designed to penetrate deep into the bolt to help release and breakdown corrosion and seeps really well and works fast, it can also help with water resistance to prevent further corrosion and I've been using the WD-40 brand for years, with WD-40 you know what you're buying, you know the quality is some of the best on the market, the flexy tube and wide spray is extreamly useful in those tight situations, you might see cheaper oils on the market, but if you want quality then this is the spray that you need.
Review: Brilliant stuff; spray, leave it for 10-15mins, come back and undo what couldn't be undone! - Absolutely superb stuff this; never used it before today and it worked a treat. My usual go-to is standard WD40 then Wurth Rost Off Ice - but ran out of that and the prices have gone silly. Thought I'd try something different and glad I did... Needed to change all the front suspension arms and track rod ends on my 2002 BMW 540i this morning whilst I was able to use my pals ramps; got the car up, wheels off, soaked all the ball joints, nuts and large bushes, nuts & bolts and left them to soak whilst I made a brew etc... Came back; all bolts undid and nuts; the ball joints were easy enough to pop out without having to resort to violence, ball joint splitters/forks or heat etc - yes they took a few whacks with a peacemaker; but they came out without any issues Very impressed and would highly recommend

## Features

- Causes skin irritation.
- Extremely flammable aerosol.
- May be fatal if swallowed and enters airways.
- May cause drowsiness or dizziness.
- Pressurised container: May burst if heated.
- Toxic to aquatic life with long lasting effects.
- 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B006UCJ5NU |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 868 in DIY & Tools ( See Top 100 in DIY & Tools ) 9 in Lubricants |
| Colour | Clear |
| Customer Reviews | 4.8 4.8 out of 5 stars (1,090) |
| Date First Available | 6 Jan. 2012 |
| Included components | 1 x WD40 Specialist Penetrant Aerosol 400Ml |
| Item Package Quantity | 1 |
| Item Weight | 374 g |
| Item model number | 7780195-HHW |
| Manufacturer | WD-40 Company |
| Material | Grease, Metal, Plastic |
| Number of Pieces | 1 |
| Part number | 443488-BPSSA02589 |
| Pattern | Single |
| Power source type | AC |
| Product Dimensions | 3 x 3 x 3 cm; 374 g |
| Size | 400ml (Pack of 1) |
| Specific uses | Car,Wheel,Window |

## Product Details

- **Brand:** WD-40 Specialist
- **Item weight:** 374 Grams
- **Liquid volume:** 0.4 Litres
- **Material:** Grease, Metal, Plastic
- **Package information:** Tin

## Images

![WD-40 Specialist Penetrant Spray 400ml - Image 1](https://m.media-amazon.com/images/I/61gRmO22SaL.jpg)
![WD-40 Specialist Penetrant Spray 400ml - Image 2](https://m.media-amazon.com/images/I/612s1MD45EL.jpg)
![WD-40 Specialist Penetrant Spray 400ml - Image 3](https://m.media-amazon.com/images/I/71dCMOScI+L.jpg)
![WD-40 Specialist Penetrant Spray 400ml - Image 4](https://m.media-amazon.com/images/I/71rRAEL-EwL.jpg)
![WD-40 Specialist Penetrant Spray 400ml - Image 5](https://m.media-amazon.com/images/I/716o31AwodL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ WD40 - Some of the best oils
*by J***T on 4 September 2025*

WD40 Penetration oil does the job on rusted nuts and bolts, it is designed to penetrate deep into the bolt to help release and breakdown corrosion and seeps really well and works fast, it can also help with water resistance to prevent further corrosion and I've been using the WD-40 brand for years, with WD-40 you know what you're buying, you know the quality is some of the best on the market, the flexy tube and wide spray is extreamly useful in those tight situations, you might see cheaper oils on the market, but if you want quality then this is the spray that you need.

### ⭐⭐⭐⭐⭐ Brilliant stuff; spray, leave it for 10-15mins, come back and undo what couldn't be undone!
*by D***B on 6 October 2025*

Absolutely superb stuff this; never used it before today and it worked a treat. My usual go-to is standard WD40 then Wurth Rost Off Ice - but ran out of that and the prices have gone silly. Thought I'd try something different and glad I did... Needed to change all the front suspension arms and track rod ends on my 2002 BMW 540i this morning whilst I was able to use my pals ramps; got the car up, wheels off, soaked all the ball joints, nuts and large bushes, nuts & bolts and left them to soak whilst I made a brew etc... Came back; all bolts undid and nuts; the ball joints were easy enough to pop out without having to resort to violence, ball joint splitters/forks or heat etc - yes they took a few whacks with a peacemaker; but they came out without any issues Very impressed and would highly recommend

### ⭐⭐⭐⭐⭐ Works fast on stuck bolts – a must-have in the toolbox
*by C***A on 30 September 2025*

I recently added the WD-40 Specialist Penetrant Spray to my toolkit, and it has already proven its value. I used it on a couple of stubborn, rusted bolts in my bike and an old garden tool, and within minutes the parts loosened up with very little effort. The spray penetrates quickly and doesn’t have the messy residue that some similar products leave behind. The nozzle gives a controlled spray, so you can target tight areas without wasting product. The smell is noticeable but not overpowering, and it doesn’t linger for long. One thing to keep in mind is that this is designed mainly as a penetrant and not as a long-term lubricant, so after freeing stuck parts it’s best to apply something else if you want ongoing protection. Overall, this is an effective, reliable product that does exactly what it promises. Definitely worth keeping on hand for household repairs, bikes, cars, or any mechanical projects.

## Frequently Bought Together

- WD-40 Specialist Penetrant Spray - Professional-Grade Lubrication for Mechanics and Industrial Applications - 400ml - Rust-Busting Formula
- WD-40 Specialist Silicone Spray Lubricant 400ml Can - Versatile All-Weather Protection for Extended Tool Life, Repels Moisture, Dust, and Grime - Smart Straw Applicator Included
- WD-40 Multi-Use Smart Straw 450ml Spray Aerosol Can Clean Rust Lubricant, blue

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-04*