Do you just add to radiator whilst full or do you have to drain radiator first ?

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.

What colour liquid is this please ? Will it change the coolant colour. thx

No, it won't change the coolant colour - it's the colour (and texture) of wallpaper paste

Hi will this work on my heater core ?

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.

Could this be used for central heating as I have small drip at bottom of radiator

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!)

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Wynn's Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - 325ml

Wynn's Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - 325ml

Product ID: 47966303

Details

Brand
Wynn's
Item dimensions L x W x H
4 x 22 x 83
Item weight
0.36 Kilograms
Material
Rubber
Style
Compact

🔥Prevents overheating & corrosion

⚙️Safe for all cooling parts

🛡️Seals small leaks fast

71.91 DT

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Description

🛠️ Seal the deal, drive with confidence!

COOLANT HARMONY - Compatible with all antifreeze types including OAT fluids for worry-free use
CORROSION DEFENSE - Guards metal parts against rust for longer engine life
LEAK PROOF CONFIDENCE - Stops radiator & head gasket leaks without hassle
SYSTEM FRIENDLY FORMULA - Protects rubber hoses, gaskets & sensors—no clogging, no damage
UNIVERSAL ENGINE COMPATIBILITY - Works seamlessly with petrol, diesel & LPG water-cooled engines

Wynn's Radiator Stop-Leak is a 325ml advanced sealing liquid designed to quickly and safely fix small leaks in radiators, cooling systems, and head gaskets. Its unique formula protects rubber and metal components, prevents clogging, and guards against corrosion and rust. Compatible with all coolant types and suitable for petrol, diesel, and LPG engines, it ensures optimal engine temperature and long-term system reliability.

Specifications

ASIN	B000297UG6
Best Sellers Rank	811 in Automotive ( See Top 100 in Automotive ) 22 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 2,165 Reviews
Global Trade Identification Number	05411693558641
Item Dimensions	4 x 22 x 83 millimetres
Item Form	Liquid
Item Highlight	Prevents Corrosion & Rust - Compatible with All Coolants/Antifreeze & OAT Fluids - Safe for Hoses & Sensors
Item Type Name	Radiator Stop Leak
Item Weight	0.36 Kilograms
Item dimensions L x W x H	4 x 22 x 83 millimetres
Item weight	0.36 Kilograms
Manufacturer	Wynn Oil UK
Manufacturer Part Number	55864
Material	Rubber
Model Number	WY55864
Number of Items	1
Number of Packs	1
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

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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71.91 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

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