---
product_id: 28491893
title: "K&W Technician Grade Knock'er Loose Lubricant Penetrant 401712 – 9 WT. Oz. Rust Penetrant for Corrosion Free Applications"
brand: "crc"
price: "€ 37.92"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.nl/products/28491893-k-and-w-technician-grade-knocker-loose-lubricant-penetrant-401712
store_origin: NL
region: Netherlands
---

# 9 wt. oz. aerosol for quick, precise application Super-fast corrosion penetration Long-lasting lubricant protection K&W Technician Grade Knock'er Loose Lubricant Penetrant 401712 – 9 WT. Oz. Rust Penetrant for Corrosion Free Applications

**Brand:** crc
**Price:** € 37.92
**Availability:** ✅ In Stock

## Summary

> 🛠️ Unlock Rust, Unlock Efficiency – Don’t Let Corrosion Slow You Down!

## Quick Answers

- **What is this?** K&W Technician Grade Knock'er Loose Lubricant Penetrant 401712 – 9 WT. Oz. Rust Penetrant for Corrosion Free Applications by crc
- **How much does it cost?** € 37.92 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/28491893-k-and-w-technician-grade-knocker-loose-lubricant-penetrant-401712)

## Best For

- crc enthusiasts

## Why This Product

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

## Key Features

- • **Rapid Rust Release:** Penetrates deep to free frozen bolts and fasteners in seconds
- • **Corrosion Combatant:** Leaves a protective lubricant barrier to prevent future rust
- • **Multi-Surface Mastery:** Effective on engine parts, machinery, hinges, and more
- • **Technician-Grade Strength:** Trusted formula designed for professional-grade maintenance
- • **Precision Aerosol Delivery:** 9 wt. oz. can ensures controlled, mess-free application every time

## Overview

K&W Technician Grade Knock'er Loose Lubricant Penetrant is a powerful 9 wt. oz. aerosol designed to rapidly dissolve rust and corrosion on automotive and industrial components. Its concentrated formula not only frees stuck fasteners but also leaves a durable lubricant layer to protect against future corrosion, making it an essential tool for professionals and DIYers aiming to maintain peak equipment performance.

## Description

Technician Grade Knock'er Loose is a super-fast penetrant that attacks corrosion to aid in disassembling tools, automobile engines, plant machinery, and other equipment for routine maintenance. It is harmless to all metals and leaves long-lasting lubrication to protect different equipment and tools against future corrosion. This penetrating lubricant works effectively on various metal fittings, hinges, bushings, washers, lugs, nuts, bolts, metal joints, and couplings.

## Features

- K&W SEALANTS & SOLUTIONS: From head gaskets and engine blocks to automatic transmissions and power steering, K&W products are made to stop leakage in aging vehicles. Our sealants provide an effective alternative to costly repairs and parts replacements.
- KNOCK'ER LOOSE: A super-fast penetrant that attacks corrosion to free rusted and corroded fasteners and components. Powerful, concentrated formula penetrates and leaves behind a long-lasting lubricant that will help prevent future corrosion.
- TECHNICIAN GRADE FORMULA: Knock’er Loose offers great performance and eases the disassembly of tools, car engines, plant machinery, and other equipment for routine maintenance.
- APPLICATIONS: Knock’er Loose works effectively to dissolve and loosen rust and corrosion from couplings, bolts, fittings, locks, washers, sliding mechanisms, hinges, bushings, nuts, and other frozen components.
- PRODUCT SPECIFICATIONS: Knock'er Loose is available in a 9 wt. oz. aerosol can

## Product Details

- **Material:** Metal
- **Brand:** CRC
- **Package Information:** Can
- **Liquid Volume:** 389.45 Milliliters
- **Item Weight:** 0.75 Pounds

## Images

![K&W Technician Grade Knock'er Loose Lubricant Penetrant 401712 – 9 WT. Oz. Rust Penetrant for Corrosion Free Applications - Image 1](https://m.media-amazon.com/images/I/71PKwlizBJL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works great
*by F***O on May 21, 2025*

The best rust solvent I've seen in a long time. Sprayed the impossible nuts and left them overnight. The next day, the nuts spun off with minimal resistance. Very impressive

### ⭐⭐⭐⭐⭐ This is the best lube/penetrant I've ever used, bar none.
*by J***G on December 24, 2024*

I don't have the words to express how impressed I am with this stuff. Example: I have a flagpole suitable for a 3x5 flag mounted to the rail on my deck. It's one of those fancy flagpoles with ball bearings down at the base of it so that the pole itself will rotate with the flag as it flaps in the breeze. The result is that the flag should never get tangled up or wrap itself around the pole.Using other lubricants (Ballistol, 3-in 1 Oil, Silicon Spray, white lithium grease), if I didn't lubricate the base a couple of times a week, the flag would start getting tangled. I applied Knock'er Loose ONCE on November 8, 2023 and it's still flying freely. That's 46 days without having to apply a second dose!Needless to say, as a penetrant, it can pop the most reluctant of frozen nuts and bolts loose, and it doesn't have to soak overnight to do it. I typically will spray the frozen offender, wait a couple of minutes, and then pop it loose. My neighbor comes over here with his frozen stuff for me to break it loose for him!I know CRC owns K&W and makes a product with the same name but in a different spray can. This, the <bold>K&W Technician Grade version in the shop sized can</bold> is the better deal at 18 oz for $9.79, compared to 13 oz of the CRC Industrial Grade version for $11.35. This is great stuff!

### ⭐⭐⭐⭐⭐ Knocker Loose or Nothing!!!!
*by A***R on April 14, 2025*

This is the BEST PRODUCT ON THE MARKET!even though PBlaster is good This is 1000% Better than PBlaster even though it is made from the same company. Once you use Knocker Loose you will never use any other penetrant.Knocker Loose dissolves Rust instantly

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-01-24*