---
product_id: 286857169
title: "Gunk C551B Radiator Repair Powder - 2 oz."
brand: "gunk"
price: "€ 34.18"
currency: EUR
in_stock: false
reviews_count: 5
url: https://www.desertcart.fi/products/286857169-gunk-c551b-radiator-repair-powder-2-oz
store_origin: FI
region: Finland
---

# Instant leak sealing Safe for all cooling system parts Rust inhibitor included Gunk C551B Radiator Repair Powder - 2 oz.

**Brand:** gunk
**Price:** € 34.18
**Availability:** ❌ Out of Stock

## Summary

> 🛠️ Fix leaks fast, drive worry-free—because your ride deserves the best!

## Quick Answers

- **What is this?** Gunk C551B Radiator Repair Powder - 2 oz. by gunk
- **How much does it cost?** € 34.18 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/286857169-gunk-c551b-radiator-repair-powder-2-oz)

## Best For

- gunk enthusiasts

## Why This Product

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

## Key Features

- • **Versatile Use:** Ideal for cars, tractors, and small trucks—be ready for anything
- • **No Drain Needed:** Apply directly without draining unless system is heavily corroded
- • **System Safe Formula:** Protects metal, rubber hoses, and gaskets from damage
- • **Instant Leak Stopper:** Seals radiator leaks immediately without downtime
- • **Universal Compatibility:** Works seamlessly with water and antifreeze solutions

## Overview

Gunk C551B Radiator Repair Powder is a powerful, easy-to-use additive that instantly stops radiator leaks and prevents new ones. Compatible with both water and antifreeze, it contains rust inhibitors and is safe for all cooling system components. Perfect for cars, tractors, and small trucks, it eliminates the need for draining unless the system is severely corroded, making it an essential emergency fix for any vehicle owner.

## Description

Gunk Radiator Repair Powder stops leaks in radiators instantly and prevents new leaks from developing. Works in both water and anti-freeze solutions. Draining and flushing before application is not necessary, unless system is extremely corroded or dirty. Contains rust inhibitor. Will not harm metal, rubber hoses, gaskets, or any part of the cooling system when used as directed. For use on car, tractor, or small trucks.

Review: Great to have in case you ever need it.
Review: The best radiator sealer ever made. This was used for years when rebuilding an engine in the coolant system on start up. To assure the head gaskets sealed. Best stuff ever.

## Features

- manufacturer: Gunk
- Item Trademark: GUNK
- Item Weight: pounds, pounds, 0.18, 0.18
- Item Category: Auto Accessory

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00200OWLG |
| Brand | Gunk |
| Customer Reviews | 4.5 4.5 out of 5 stars (17) |
| Date First Available | 6 July 2019 |
| Item Weight | 454 g |
| Item model number | C551B |
| Manufacturer | Gunk |
| Manufacturer Part Number | C551B |
| Product Dimensions | 2.54 x 2.54 x 2.54 cm; 453.59 g |

## Images

![Gunk C551B Radiator Repair Powder - 2 oz. - Image 1](https://m.media-amazon.com/images/I/71QtuoGLG4L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by P***S on 23 October 2023*

Great to have in case you ever need it.

### ⭐⭐⭐⭐⭐ Review
*by W***R on 13 July 2023*

The best radiator sealer ever made. This was used for years when rebuilding an engine in the coolant system on start up. To assure the head gaskets sealed. Best stuff ever.

### ⭐⭐⭐⭐⭐ Review
*by S***. on 31 December 2020*

I have had good luck with this in sealing small radiator seepage. Has been holding for a couple years and no problems with blockage that I have seen. Cheep "fix"!

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**Shop now:** [https://www.desertcart.fi/products/286857169-gunk-c551b-radiator-repair-powder-2-oz](https://www.desertcart.fi/products/286857169-gunk-c551b-radiator-repair-powder-2-oz)

---

*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-16*