Explore Iconic Radiator Leak Sealer Collections

Unlock the true essence of Radiator Leak Sealer—where craftsmanship and performance meet.

Bar's Leaks 1196 Radiator Stop Leak - 11 oz. , Grey

4.3

USAStore

$128,439

Fernox 61016 Leak Sealer LS-X External Or Internal Water Pipe Leakage Repair Seal Jointing Compound 50g. Suitable for use on a wide range of materials including copper, stainless steel, and plastic.

4.1

UKStore

$20,019

K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

4.3

USAStore

$30,309

Bar's Leaks HDC Radiator Stop Leak Tablet - 60 Grams, Brown

4.3

USAStore

$7,479

Liqui Moly Radiator Stop Leak | 250 ml | Cooler additive | SKU: 20132

4.4

USAStore

$13,839

Prestone AS145 Stop Leak Repair for Radiators, Heater Cores, and Hoses, 11 oz., 1 Pack

4.4

USAStore

$23,059

K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

4.2

USAStore

$16,959

Wynn'sCar Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

4.3

UKStore

$10,339

K-Seal ST5501 Multi-Purpose One Step Permanent Coolant Leak Repair, 8oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

4.3

USAStore

$16,659

FERNOX Central Heating Leak Sealer F4 Express 400ml - Fast Results - 30 sec - (Replacement 58232)

4.3

UKStore

$38,579

Sentinel Leak Sealer 1L, Seals All Minor leaks and Weeping Joints in Heating Systems, Suitable for All Metals Including Aluminium, Will not Cause blockages in The Heating System

4.5

UKStore

$43,469

ACDelco GM Original Equipment 10-108 (12378255) Cooling System Sealing Tabs - 4 g

4.6

USAStore

$7,279

ATP Automotive AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle

4.5

USAStore

$25,709

Bar's Leaks Radiator Stop Leak 2X Concentrate, 6 oz.

4.1

USAStore

$19,819

Fernox61016 50ml LS-X External Leak Sealer

4.4

UKStore

$11,219

BG Universal Cooling System Sealer

4.6

USAStore

$23,869

Radiator Stop Leak Sealer Conditioner | Quick-Seal Formula | 20G Tube | Compatible with All Coolants | Metal, Plastic & Rubber Safe | Car Heater Core & Radiator Repair

4.5

USAStore

$12,055

Permatex 30301 Radiator Repair - Stop Leak, 16 fl oz, Protecting Against Coolant Loss, Stopping Leaks and Seepage from Head Gaskets

4.5

USAStore

$23,309

Super Glue Pro Seal N62020 Instant Gas Tank and Radiator Repair

4.1

USAStore

$5,549

Car Radiator & Hose Stop Leak Repair Additive Anti Corrosion 250ml Repairs Weld Cooling System Rads

4.4

UKStore

$11,729

Bar's Leaks1186 Liquid Aluminum Stop Leak - 16.9 oz

4.3

USAStore

$426,599

Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz.

4.2

USAStore

$12,799

Bar's Leaks PLT11 Pelletized HD Radiator Stop Leak - 11 oz.

4.3

USAStore

$13,359

Bar's Leaks HG-1 HEAD SEAL Blown Head Gasket Repair

4.1

USAStore

$44,799

BlueDevil Products 38386 Head Gasket Sealer - 1 Quart

4.0

USAStore

$64,399

Bond It F4 Emergency Self-Fusing Silicone Tape, Repair Plumbing Pipe & Radiator Hose Leak, Electrical Insulation, Permanent Bonding, Waterproof, 1" x 36' x 20mil, Red

4.3

USAStore

$20,319

Genuine WELDIT Radiator Leak Seal and Conditioner

3.5

USAStore

$28,699

XADOATOMEX Stop Leak Radiator Coolant Additive - Repair Seal, Restore Radiator Fluid Fix and Prevent Future Leaks (Bottle, 250 ml)

3.7

USAStore

$24,589

K-Seal ST3501 Pour and Go Head Gasket Sealer, 16oz, Permanent Repair for Blown Head Gaskets, Cracked Heads and Blocks

4.0

USAStore

$33,319

ABRO Heavy Duty Stop Leak Liquid, 11 oz., Fast-Acting, Safely Seals Leaks, Permanent Seal for Cooling Leaks, Lubricant & Rust Inhibitor, Ideal for Radiators, Water Pumps & Head Gaskets

3.6

USAStore

$12,969

Bars Leaks 01194 6 Oz Radiator Stop Leak Concentrate

4

USAStore

$33,779

Bars Leaks 01196 11 Oz Radiator Stop Leak Concentrate

5.0

USAStore

$15,039

XADOATOMEX Oil Additive Stop Leak Engine - Restore Seal and Gaskets, Treatment for Car Engine High Mileage or Rear Main Seal, Best Stopper Leaks Reseal (Bottle, 250 ml)

4.0

USAStore

$25,579

Niteo Motor Medic C312 Radiator Sealer and Stop Leak - 11 oz.

5.0

USAStore

$16,389

J-B Weld8277 WaterWeld Epoxy Putty Stick - 2 oz., Off White

4.2

USAStore

$9,239

Mr. Blockhead Permanent Block & Radiator Sealer

5.0

USAStore

$31,589

Liqui Moly Radiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

4.3

USAStore

$21,529

Rescue Tape, Self-Fusing Silicone Tape, Emergency Plumbing Pipe & Radiator Hose Repair, Electrical Insulation, Military Std, 1" x12', Blue

4.1

USAStore

$13,179

J-B Weld 2120 Radiator Repair Kit

4.0

USAStore

$15,989

Bar's Leaks Radiator Stop Leak, 11 oz

USAStore

$3,226

BlueDevil Products 00205 Radiator & Block Sealer - 16 Ounce

4.0

USAStore

$31,019

AlumAseal ASLC16 Radiator Stop Leak and Conditioner Liquid - 16 Fl oz.

4.2

USAStore

$23,939

Bar's LeaksOS-1 Seal Engine Oil Burning/Leak Repair - 16.9 oz.

4.1

USAStore

$23,969

ABRO Super Seal, 11.4 oz., Permanently Seals Cracks & Holes, Copper Infused Liquid Glass Sealer, Withstands Extreme Conditions, Ideal for Engine Blocks, Radiators, Head Gaskets, & Freeze Plugs

3.4

USAStore

$21,339

Radiator Stop Leak Sealer Conditioner Radiator Repair Kit Car Heater Core, Freeze Plugs, Cooling System & Radiator Repair

4.6

USAStore

$16,289

Bar's Leaks Rear Main Seal Repair, 16.9 oz

4.1

USAStore

$138,479

Bar's Leaks Radiator Stop Leak Tablets, 1.76oz, Pack of 7

4.3

USAStore

$54,779

Bar's LeaksHigh Mileage Cooling System Repair

4.2

USAStore

$13,309

GranvilleCe-Lit Radiator Stop Leak Cement Sealant Powder (1)

4.1

UKStore

$7,189

Bar's Leaks High Mileage Transmission Repair-It, 16.9 Fl Oz

4.4

USAStore

$17,039

Fernox F4 Leak Sealer 500ml Liquid Seal for Central Heating Pipe Work Leaks Water Underfloor Heating Non-Corrosive, Non-Toxic, Compatible with Most Heating Systems, Easy to Use, Long-Lasting Seal.

4.8

UKStore

$42,949

Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop Leak - 18 oz. (4 Pack)

5.0

USAStore

$13,971

300g Invisible Waterproof Anti-Leaking Sealant Agent, Transparent Waterproof Coating Agent, Waterproof Insulation Sealant, Coating Tile Trapping Repair Wall Mending Agent for Home Roof Bathroom

4.1

UKStore

$16,089

AMK® Holts Radweld Stops Leaks In Radiator & Hoses For Car Cooling System 250ml Repairs Leak

4.5

UKStore

$24,199

Genuine GM Fluid 12378255 Cooling System Seal Tablet - 4 Grams, (Pack of 5)

4.6

USAStore

$12,379

Dike Radiator Stop Leak - 1 Pint

4.1

USAStore

$27,569

Liqui MolyRadiator Stop Leak | 150 ml | Cooler additive | SKU: 8956

4.3

UKStore

$24,409

CosWarm CW4 Central Heating Leak Sealer - Treats Up to 18 Radiators - Stops Leak - Boiler Leak Repair & Sealant - Stops Minor Leaks & Weeps, Fixes Pressure Loss & Leaking Pipes - Underfloor Heating

4.2

UKStore

$35,859

BlueDevil Products 00234 Rear Main Sealer - 8 Ounce

4.0

USAStore

$25,829

Holts 1831469 Radweld Plus New Formula 250ml

4.6

UKStore

$51,799

Holts Sealit Leak Repair 250ml, (Packing May Vary)

4.1

UKStore

$61,909

Bar's LeaksC16 Liquid Radiator Stop Leak - 11 oz.

4.1

USAStore

$12,529

Corgi TRIPCON5-C Concentrated Central Heating Leak Sealer - Clear

4.4

UKStore

$20,889

K-SealHD Coolant Leak Repair, 472ml | HGV Radiator, Block & Head Gasket Sealant

4.2

UKStore

$30,429

Spray & Seal Leak Fix Stop Sealant Instant Waterproof Gutter Roof Pipe - White

3.7

UKStore

ZWL11,109

Pro-Kleen Instant Waterproof Sealant Spray - Tough Leak Sealant Spray for Roofs, Pipes, Guttering & More - Transparent & Long-Lasting Formula - Instant Emergency Repair (400ml)

4.2

UKStore

$17,669

Domestic Radiator Epoxy Repair Putty Kit - Repairs Chips, Cracks, Leaks & Similar Damage to Enamel, Steel, Brass, Cast Iron Radiators. (White)

UKStore

$5,889

[2X 400ml] Stop the Leak Sealer Spray Waterproof Sealant for Pipe Leaks Cracks Instant Solution

4.1

UKStore

$18,729

K-Seal Coolant Leak, 236ml | Multi-use Car Radiator & Head Gasket Repair Sealant

4.3

UKStore

$22,479

EverbuildP32 Central Heating System Leak Sealer, 500 ml

4.0

UKStore

$8,140

K-Seal Permanent Coolant Leak Repair for Cooling Systems Head Gaskets Radiators

4.2

UKStore

$31,679

Fernox 56603 Leak Sealer

4.4

UKStore

$35,869

TetrionMake Good Fix a Leak 400ml

4.1

UKStore

$15,529

Permatex 30301 Radiator Repair - Stop Leak, 16 fl oz, Protecting Against Coolant Loss, Stopping Leaks and Seepage from Head Gaskets

UKStore

$9,164

Draper50 ml Liquid Sealant | Gasket Sealer | Pipe Leak PTFE | Plumbing Tool | Waterproof Sealer | Metal Joints Rapid Cure | 38916

4.3

UKStore

$17,639

VITCAS310ml Central Heating - Leak Sealer – Concentrate - Accelerates Cleaning – Restores Heating Efficiency - Removes Scale - Flux Residue - Extends Boiler Life

3.9

UKStore

$26,379

HoltsLOYRW2R Radweld 250ml

4.4

UKStore

$6,239

Liquid Waterproof Sealant, Hupeyna Invisible Waterproof Agent, Transparent Repairing Leak Waterproof Adhesive, Indoor and Outdoor Water-Based Waterproof Coating 35 Ounces

4.4

UKStore

$33,069

INSTANT LEAK SEALER CLEAR - 400ml - Instant Waterproof Sealant - Ideal for Drain & External Pipes and Guttering Leaks & Cracks - UV Stable - Interior & Exterior Use

4.0

UKStore

$17,729

KSealPermanet Radiator Coolant Repair - Fixes Head Gaskets, Cooling Systems - Radiator Sealer

3.8

UKStore

$22,679

Bars Powdered Radiator, Engine Block and Gasket Leak Sealant 15 gr

4.5

UKStore

$7,109

ENGINE SEAL HEAD GASKET SEALER ,MCP, REPAIRS BLOWN HEAD GASKET & ENGINE BLOCKS,,USING ALL AUTOMOTIVE MANUFACTURES,,,Engine Seal ,MCP,,Confirmed UK Examination of Trademark Standard ,ENGINE SEAL WRAPPED BLOWN HEAD GASKETS & ENGINE BLOCKS,,,DIESEL & PETROL,,,Engine Seal, fixes most leaks in all types of water cooled engine including cracked heads, head gasket failures, cracked blocks, radiators, heater cores and water pumps.

3.8

UKStore

$26,779

Pro-Kleen Instant Waterproof Sealant Spray - Tough Leak Sealant Spray for Roofs, Pipes, Guttering & More - Transparent & Long-Lasting Formula - Instant Emergency Repair (2 x 400ml)

4.2

UKStore

$26,979

Radweld Radiator Sealer & Stop Leak - 250ml

3.9

UKStore

$14,989

VITCAS 1Ltr Central Heating Internal Leak Sealer Ideal for Drain plastic tanks, micro bore Cracks-all metals- Instant Repair -Long Lasting Protection-all metals

3.6

UKStore

$26,519

Everad - 500ml Concentrated Leak Sealer for Central Heating Systems & Radiators - Seals Small Leaks & Weeping Joints Under an Hour - for Multi-Metal Systems – Including Aluminium. Non Acid

3.8

UKStore

FREE

AdeyMCXS - External Leak Sealant & Jointing Compound,50ml

4.0

UKStore

$12,929

LIQUI MOLY Pro-Line Radiator Stop Leak K | 250 ml | Cooler additive | SKU: 5178

4.5

UKStore

$20,279

HoltsRadweld Radiator and Coolant System Leak Repair 250ml No

4.7

UKStore

$14,149

RealthSilicone Gasket Maker | 1 Pack 3.53 Oz(100g) | Ultra Black RTV | High Temperature | Oil Resistance | High Strength Flange Sealing for Automotive Machine Equipment Repairing(SG119)

4.5

UKStore

$15,489

Concentrated Leak Sealer - Boiler Central Heating System (A500)

4.3

UKStore

$3,706

Wynn'sEngine Oil Stop Leak Sealer Treatment Additive For All Engine Types 325ml & Car Radiator Stop Leak Sealant Antifreeze Coolant Repair Additive 325ml

4.2

UKStore

$6,858

Epoxy Putty, Repair Epoxy Putty Stick Metal Filler Pipe Repair Hard Plastic Ceramic Fibreglass Stone Glass Hole Filler, Bonding Leaks Putty Repair Waterproof Quick Fixes

4.0

UKStore

$12,009

2X50 g Plumbers Mait Quick Leak Repair Putty Sealant - Brown

UKStore

$24,669

Polar Black Leak Sealer Spray - 400ml - Tough Waterproof Sealant, Ideal for Drain & External Pipe Leaks & Cracks - Instant Repair & Long Lasting Protection - Interior & Exterior Use

UKStore

$34,869

Leak Saver Direct Inject AC Leak Sealer Small System | AC Stop Leak for Most HVAC Systems Up to 1 Ton | Works with All Systems & AC Refrigerants | Made in The USA

4.2

USAStore

$33,589

JENOLITE Stop Leak Sealer Spray | WHITE | 400ml | Leak Sealer for Gutters and Flat Roofs | Waterproof Gutter Sealant | Fills, Seals & Stops Leaks | Long Lasting Waterproof Sealant

4.0

UKStore

$19,489