Advertising Disclosure Car Radiator Leak Sealant Comparison - June 2025
6 Best Car Radiator Leak Sealant In the UK
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
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| 1 Best Choice  9.9Exceptional | 2  9.7Exceptional | 3  9.6Exceptional | 4 Best Value  9.5Excellent | 5  9.3Excellent | 6  9.0Excellent |
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ModelK-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant | Model ARZER Car Radiator & Hose Stop Leak Repair Additive - Anti Corrosion 250ml - Repairs Weld Cooling System Rads | Model LIQUI MOLY Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178 | Model Wynn's Radiator Stop-Leak - Seals Radiator & Head Gasket Leaks - Prevents Corrosion & Rust - Compatible with All Coolants/Antifreeze & OAT Fluids - Safe for Hoses & Sensors - 325ml | Model LIQUI MOLY Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956 | Model AMK® Holts Radweld Radiator Leak Sealer 250ml Stop Cooling System Repair Permanent Seal Fix Antifreeze Compatible Coolant Emergency Automotive Quick Pour Go Vehicle Maintenance |
BrandK-Seal | Brand ARZER | Brand Liqui Moly | Brand Wynn's | Brand Liqui Moly | Brand AMK |
Reviews | Reviews | Reviews | Reviews  | Reviews | Reviews |
Features | |||||
Worth the money 9.1 | Worth the money  9.4 | Worth the money 9.3 | Worth the money 9.4 | Worth the money 8.1 | Worth the money 7.4 |
Simple to use 9.8 | Simple to use 9.9 | Simple to use 9.9 | Simple to use 9.9 | Simple to use 9.1 | Simple to use 8.4 |
Tech Specs | |||||
item weight 274 g | item weight 270 g | item weight 275 g | item weight 370 g | item weight 150 g | item weight 259 g |
manufacturer part number ST5501 | manufacturer part number RW2R | manufacturer part number 5178 | manufacturer part number 55864 | manufacturer part number 8956 | manufacturer part number 376796 |
customer reviews4.3 4.3 out of 5 stars 10, 853 ratings 4.3 out of 5 stars | customer reviews 4.3 4.3 out of 5 stars 438 ratings 4.3 out of 5 stars | customer reviews 4.5 4.5 out of 5 stars 2, 218 ratings 4.5 out of 5 stars | customer reviews 4.3 4.3 out of 5 stars 1, 761 ratings 4.3 out of 5 stars | customer reviews 4.3 4.3 out of 5 stars 1, 379 ratings 4.3 out of 5 stars | customer reviews 4.2 4.2 out of 5 stars 4 ratings 4.2 out of 5 stars |
product dimensions 20 x 5.08 x 15.24 cm 274 g | product dimensions - | product dimensions 66.09 x 23.6 x 13.41 cm 275 g | product dimensions 1.8 x 3.38 x 9.22 cm 370 g | product dimensions 10 x 5 x 5 cm 150 g | product dimensions 14 x 7 x 4 cm 258.55 g |
model K-Seal Coolant Leak Repair | model - | model Pro-Line Radiator Sealer K | model Wynn's 55864, Radiator Stop Leak, 325ml | model 4100420089565 | model 376796 |
Available On | Available On | Available On | Available On | Available On | Available On |
Our Top 3 Picks
Here are the top 3 recommended products with more information to help you find the right product for you
9.7
2
ARZERARZER Car Radiator & Hose Stop Leak Repair Additive - Anti Corrosion 250ml - Repairs Weld Cooling System Rads
9.9 Simple to use9.4 worth the moneyWhy we love it
Seals leaks quickly and effectively.
Compatible with antifreeze solutions.
Prevents rust and corrosion.
Our ranking system
The TopChoice.co.uk Team selects top-of-the-line items from a wide selection and conducts rigorous evaluations on almost all the products available on the internet. We rank each product based on how well it matches our criteria.We can ensure that the product is well-tested with the help of our expertise, experts, and artificial intelligence technology. TopChoice.co.uk requires consistent care for the products we review, ensuring that our assessments are always accurate and up to date.
Features
Our team of experts analyzes key attributes, capabilities, significance, and many more depending on the type of product to determine its effectiveness.
Consumer Reviews
We ensure an evaluation of the ratings using references all over the internet for each product. With the help of our AI technology and professional review teams, we give weight to the worth of individual user experiences.
Popularity
Popularity is an important criterion in choosing a product. Several factors contribute to the popularity of the products on our site, including prestige, relevance, reputation, news, and more.
Value for money
TopChoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
Value for money
TopChoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
