---
product_id: 47966303
title: "Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - Prevents Corrosion & Rust - Compatible with All Coolants/Antifreeze & OAT Fluids - Safe for Hoses & Sensors - 325ml"
brand: "wynn's"
price: "₱1901"
currency: PHP
in_stock: true
reviews_count: 8
category: "Wynn's"
url: https://www.desertcart.ph/products/47966303-radiator-stop-leak-seals-radiator-and-head-gasket-leaks-prevents
store_origin: PH
region: Philippines
---

# Maintains sensor accuracy Seals small leaks fast Prevents corrosion & rust Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - Prevents Corrosion & Rust - Compatible with All Coolants/Antifreeze & OAT Fluids - Safe for Hoses & Sensors - 325ml

**Brand:** wynn's
**Price:** ₱1901
**Availability:** ✅ In Stock

## Summary

> 🚗 Seal the deal, skip the garage drama!

## Quick Answers

- **What is this?** Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - Prevents Corrosion & Rust - Compatible with All Coolants/Antifreeze & OAT Fluids - Safe for Hoses & Sensors - 325ml by wynn's
- **How much does it cost?** ₱1901 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ph](https://www.desertcart.ph/products/47966303-radiator-stop-leak-seals-radiator-and-head-gasket-leaks-prevents)

## Best For

- wynn's enthusiasts

## Why This Product

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

## Key Features

- • **Corrosion Defense:** Forms a protective barrier against rust, extending cooling system lifespan.
- • **System-Safe Formula:** Compatible with all coolants & OAT fluids, protects hoses & sensors without damage.
- • **Clog-Free Performance:** Keeps radiator waterways and temperature sensors clear for optimal engine temp control.
- • **Leak-Proof Confidence:** Stops minor radiator & head gasket leaks in minutes, saving costly repairs.
- • **Universal Engine Compatibility:** Perfect for petrol, diesel & LPG engines—your all-in-one cooling system guardian.

## Overview

Wynn's Radiator Stop-Leak is a 325ml advanced liquid formula designed to quickly seal small leaks in radiators, cooling systems, and head gaskets. It prevents coolant loss and overheating while protecting against corrosion and rust. Safe for all cooling system components including rubber hoses and sensors, it maintains accurate temperature readings without clogging. Compatible with all coolant types including OAT fluids, it works across petrol, diesel, and LPG engines to extend system life and reduce maintenance costs.

## Description

Product Description This high-performance sealing product is specially designed to stop small leaks in the radiator, cooling, and heating systems, ensuring reliable and long-lasting engine operation. Formulated to prevent coolant loss, it helps maintain the engine at optimal temperature levels while minimising the risk of overheating. By sealing leaks in the head gasket and other system components, it extends the life of the cooling system and helps prevent costly repairs. Unlike some sealants that can be abrasive or cause clogging, this formulation is carefully designed to be safe for all parts of the cooling system. Developed to work without harming rubber hoses, gaskets, or metal components, this product offers excellent compatibility with all standard antifreeze and coolant types, including OAT (organic acid technology) fluids. The advanced formula ensures that it does not create blockages within the system, keeping radiator waterways and temperature sensors free from obstructions. This feature allows for accurate temperature monitoring and optimal heat dissipation, preventing further engine issues. In addition to sealing leaks, this product provides enhanced protection against corrosion and rust. By forming a protective barrier inside the cooling system, it prevents the formation of rust and corrosion, which can lead to severe damage over time. This added layer of protection helps maintain the cooling system’s efficiency and ensures long-term reliability. Suitable for petrol, diesel, and LPG engines, this product is highly versatile and can be used in any "water" cooled engine system. It is recommended not only for addressing existing leaks but also as a preventive maintenance solution to avoid potential issues before they become severe. By reinforcing the cooling system’s integrity, it ensures that the vehicle remains in peak operating condition, providing peace of mind and long-lasting protection against leaks, corrosion, and overheating. Manufacturer's Description Wynns Radiator Stop Leak Compatible withnall coolants and anti-freeze. Radiator stop leak will seal small leaks without damage to rubber hoses , gaskets or other system components. Formulated to stop and prevent leaks in the radiator and cooling system , protect against rust and corrosion and to lubricate the water pump. Note . Radiator stop leak will not repair broken or split hoses. Size 325ml.

Review: It really works!! - My car started leaking water from the cooling system, it slowly got worse yet we couldn't work out where it was leaking. I was having to top up my coolant every 2-3 days. Even my local garage said it's going to have to get worse before we can see where it's leaking!! Decided to buy some of this as the reviews were good, poured it in the radiator, drove it around 5 miles, no more leaks!! This has been in my car around 3 or 4 months now and still not had to top up my water. Fantastic stuff, will 100% recommend this product as it's solved my water leak. Obviously for major leaks or split hoses etc this will not be suitable.
Review: This works! - I had a really small leak from my coolant system, but enough that I had to top up coolant every other day. I used this and it's cured it amazingly. Really great stuff.

## Features

- Contains 1,2-benzisothiazol-3(2H)-one. May produce an allergic reaction.
- Safety data sheet available on request.
- ✅ EFFECTIVE SEALING FOR SMALL LEAKS IN THE COOLING SYSTEM: Designed to address minor leaks efficiently, this advanced sealing product provides a quick and durable solution for cooling system issues. Its specialised formula effectively seals leaks in the radiator, cooling, and heating systems, as well as in the head gasket, ensuring optimal engine performance. The innovative composition prevents coolant loss, reducing the risk of overheating and potential engine damage. Unlike conventional sealants, this formula is developed to integrate seamlessly with existing coolant fluids, offering long-lasting protection without compromising system efficiency.
- ✅ SAFE FOR RUBBER HOSES, GASKETS, AND SYSTEM COMPONENTS: Engineered with compatibility in mind, this sealant is safe for all components within the cooling system, including rubber hoses, gaskets, and metal parts. Its non-aggressive formulation ensures that seals and hoses maintain their flexibility and structural integrity over time. This protection helps extend the lifespan of cooling system parts, reducing maintenance costs and preventing premature wear. Additionally, the product is designed to work without causing deposits or blockages, keeping the cooling system functioning optimally.
- ✅ PREVENTS CLOGGING AND ENSURES TEMPERATURE SENSOR ACCURACY: Unlike some sealing products that can lead to buildup and reduced efficiency, this formulation is designed to avoid clogging radiator waterways and temperature sensors. By maintaining proper coolant flow and accurate temperature readings, this product ensures that the engine operates within the ideal temperature range, preventing overheating or inefficiencies. Its compatibility with various antifreeze and coolant types makes it a versatile and reliable choice for ongoing maintenance and preventive care.
- ✅ ENHANCED PROTECTION AGAINST CORROSION AND RUST: Offering more than just leak prevention, this product also provides enhanced protection against corrosion and rust. Exposure to heat, moisture, and coolant chemicals can lead to internal corrosion, weakening the system and leading to expensive repairs. This advanced formulation actively protects metal components from rust and corrosion, helping to maintain engine efficiency and prolong the lifespan of the cooling system. Its compatibility with OAT (organic acid technology) fluids and all standard antifreeze products ensures easy integration into any system.
- ✅ VERSATILE APPLICATION FOR PETROL, DIESEL, AND LPG ENGINES: Ideal for all "water" cooled systems, this sealant is suitable for a wide range of engine types, including petrol, diesel, and LPG. It is recommended not only for repairing minor leaks but also as a preventive solution to avoid potential issues before they escalate into costly repairs. By reinforcing the integrity of the cooling system, this product helps maintain vehicle reliability and performance under various driving conditions. Whether used for routine maintenance or emergency repairs, it offers an effective and lasting solution for cooling system leaks.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000297UG6 |
| Best Sellers Rank | 3,136 in Automotive ( See Top 100 in Automotive ) 47 in Antifreeze & Coolants |
| Brand | Wynn's |
| Colour | _ |
| Compatible Material | Aluminium, Metal, Plastic |
| Country Of Origin | United Kingdom |
| Customer Reviews | 4.3 out of 5 stars 2,122 Reviews |
| Global Trade Identification Number | 05411693558641 |
| Item Dimensions | 4 x 22 x 83 millimetres |
| Item Form | Liquid |
| Item Type Name | Radiator Stop Leak |
| Item Weight | 0.37 Kilograms |
| Item dimensions L x W x H | 4 x 22 x 83 millimetres |
| Item weight | 0.37 Kilograms |
| Manufacturer | Wynn Oil UK |
| Material | Rubber |
| Style | Compact |
| Style Name | Compact |
| Surface Recommendation | Metals and alloys commonly found in automotive cooling systems (e.g., aluminum, steel) |
| Unit Count | 325.0 millilitre |
| Water Resistance Level | Water Resistant |
| Water resistance level | Water Resistant |

## Product Details

- **Brand:** Wynn's
- **Item dimensions L x W x H:** 4 x 22 x 83 millimetres
- **Item weight:** 0.37 Kilograms
- **Material:** Rubber
- **Style:** Compact

## Images

![Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - Prevents Corrosion & Rust - Compatible with All Coolants/Antifreeze & OAT Fluids - Safe for Hoses & Sensors - 325ml - Image 1](https://m.media-amazon.com/images/I/51s+4wnrGiL.jpg)

## Questions & Answers

**Q: Do you just add to radiator whilst full  or do you have to drain radiator first ?**
A: If your radiator is full,then it sounds like you don't need it. But if you can't see the water, then pour the stuff in and top up with water. Then away you go. Don't forget to check later on.

**Q: What colour liquid is this please ? Will it change the coolant colour. thx**
A: No, it won't change the coolant colour - it's the colour (and texture) of wallpaper paste

**Q: Hi will this work on my heater core ?**
A: Not sure - I think it would depend where in the core the leak is and what material it's made from (so probably unlikely to work with plastic components or leaks from pipe attachment points, for example). But considering how difficult most heaters are to replace it's got to be worth a try.

**Q: Could this be used for central heating as I have small drip at bottom of radiator**
A: Radiator stop leak is designed to mix with car coolant running at much higher temperatures than domestic boilers. Plus the mix ratio would be out. Wouldn't know how many litres of water in heating system. Can understand why hypothetically it could work but don't try it. 
If its an emergency fix try using CT1 sealant on the external section where leak is on radiator if you can see it. (Not in the radiator!)

## Customer Reviews

### ⭐⭐⭐⭐⭐ It really works!!
*by C***P on 20 July 2025*

My car started leaking water from the cooling system, it slowly got worse yet we couldn't work out where it was leaking. I was having to top up my coolant every 2-3 days. Even my local garage said it's going to have to get worse before we can see where it's leaking!! Decided to buy some of this as the reviews were good, poured it in the radiator, drove it around 5 miles, no more leaks!! This has been in my car around 3 or 4 months now and still not had to top up my water. Fantastic stuff, will 100% recommend this product as it's solved my water leak. Obviously for major leaks or split hoses etc this will not be suitable.

### ⭐⭐⭐⭐⭐ This works!
*by Z***. on 30 August 2025*

I had a really small leak from my coolant system, but enough that I had to top up coolant every other day. I used this and it's cured it amazingly. Really great stuff.

### ⭐⭐⭐⭐ One of the best
*by M***T on 7 December 2025*

I tried what i thought was the best on (K Seal) which didn't work. then i tried this stuff, miles better, worked a treat. If i need to stop a small leak now this is the stuff i would buy again.

## Frequently Bought Together

- Wynns Radiator Stop Leak 325ml
- Wynn's 28263 Diesel Particulate Filter Cleaner
- #1 DPF foam cleaner Diesel particulate filter without disassembling easy to use Latest cleaning technology cleaner

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.ph/products/47966303-radiator-stop-leak-seals-radiator-and-head-gasket-leaks-prevents](https://www.desertcart.ph/products/47966303-radiator-stop-leak-seals-radiator-and-head-gasket-leaks-prevents)

---

*Product available on Desertcart Philippines*
*Store origin: PH*
*Last updated: 2026-03-07*