Best Coolant Leak Sealant - April 2024

K-Seal ST5501 Multi Purpose One Step Permanent Coolant Leak Repair

K-Seal 8 fluid ounce bottle is effective to 20 quarts cooling capacity. Just shake, pour and go. It repairs leaks and cracks in radiator, head gasket, heater core, freeze plugs, water pump casing, cylinder heads and engine blocks.

• ASIN: B001QT9KO6
• UPC: 812646010004
• ASIN: B001QT9KO6
• Brand: K-Seal
• Manufacturer: K-Seal

Bar's Leaks J-100 Professional DiFM Cooling System Treatment, 5-Gram Tablets

If you are a car enthusiast and know your way around under the hood, you might want to try our professional-series DiFM Professional Cooling System Treatment tablets. They are the perfect product to use any time you are servicing the cooling system, including parts replacement, flush and fills. This product inhibits the formation of rust and scale, keeps the system clean, neutralizes pH imbalance, controls electrolysis, lubricates and seals internal, external and coolant-to-oil leaks. These tablets fully dissolve in minutes and are harmless to ALL plastic, metals, aluminum, hoses and connectio... [Read More]

• ASIN: B003RGBUTE
• UPC: 046087011058
• ASIN: B003RGBUTE
• Brand: Bar's Leaks
• Manufacturer: Bar's Leaks

K&W 401224-6 FiberLock Head Gasket & Block Repair - 32 Fl Oz

Permanent pour 'n go head gasket & block repair compatible with all types of antifreeze. Repairs cooling system leaks w/3 unique technologies: military-strength fibers nanotechnology & Cool-X Conditioner-the ultimate solution for all coolant leaks.

• ASIN: B006OW2PIS
• UPC: 078372012242
• ASIN: B006OW2PIS
• Brand: K&W
• Size: 32 Fluid Ounces
• Manufacturer: CRC

K-Seal ST5516 HD Multi Purpose One Step Permanent Coolant Leak Repair

K-Seal 8 fluid ounce bottle is effective to 20 quarts cooling capacity. Just shake, pour and go. It repairs leaks and cracks in radiator, head gasket, heater core, freeze plugs, water pump casing, cylinder heads and engine blocks. For truck, tractor, industrial, RV and large capacity engines.

• ASIN: B002BJEG3U
• UPC: 812646010066
• ASIN: B002BJEG3U
• Brand: K-Seal
• Manufacturer: K-Seal

Genuine GM (12378255) Fluid 3634621 Cooling System Seal Tablet - 4 Grams, (Pack of 5)

Original organic formula designed for use in radiator systems to seal leaks and prevent leaks due to casting porosity in engine components. Seals minor leaks and porosity in cooling systems. DEX-COOL compatible. Non-toxic.

• ASIN: B000QIH3C4
• ASIN: B000QIH3C4
• Brand: Genuine GM
• Size: Pack of 5
• Manufacturer: GM

Irontite All Weather Seal, Blue, 16 oz

Stops Cooling System Leaks. The easiest Head Gasket and Radiator Sealant to use. Mixes with anti-freeze and circulates to seal gaskets and fill porosity and small cracks. The Number One Choice in any Climate, from extreme heat to the freezing cold. All Weather Seal is versatile and effective. Non-metallic formula scientifically created in the 60's. It's been used by professionals to stop and prevent engine cooling system leaks for decades. It's now available to everyone. Great for commercial vehicles, used cars, industrial applications, etc. Gas, diesel, propane, any engine with a liquid cooli... [Read More]

• ASIN: B002BIZJMS
• UPC: 805028130162
• ASIN: B002BIZJMS
• Brand: Irontite
• Size: 16 oz
• Manufacturer: Irontite Products Inc.

FJC 9140 Stop Leak - 3 Ounce

R134A AC System Stop Leak; with Red Dye; Will only seal holes in rubber hoses & enlarges "O" rings

• ASIN: B0002JMFKM
• UPC: 609989007859
• ASIN: B0002JMFKM
• Brand: FJC INC.
• Size: 3oz
• Manufacturer: FJC Inc.

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

Bar's Leaks Head Gasket and Cooling Sealant repairs blown head and intake gasket leaks. Seals cracked cylinder heads and blocks. Stops heater core and radiator leaks. Fixes leaking freeze and core plugs.

• ASIN: B003RGIWO0
• UPC: 046087011362
• ASIN: B003RGIWO0
• Brand: Bar's Leaks
• Size: Pack of 1
• Manufacturer: Bar's Leaks

Bar's Leaks Liquid Aluminum Stop Leak - 16.9 oz

Bar's Leaks Liquid Aluminum Stop Leak seals radiator leaks. Seals freeze plug leaks. Repairs gasket leaks and heater core leaks. Lowers water temperature.

• ASIN: B002696FA2
• UPC: 046087011867
• ASIN: B002696FA2
• Brand: Bar's Leaks
• Size: Pack of 1
• Manufacturer: Bar's Leaks

Prestone AS145 Radiator Sealer Stop Leak - 11 oz.

Prestone Radiator Stop Leak features a patented formula that quickly stops leaks in radiators, water pumps, and heater cores while also protecting against pitting and corrosion. Prestone Radiator Stop Leak takes sealing performance to a higher level by both stopping the leak as well as the corrosive condition that causes leaks in the first place. Its unique combination of natural and synthetic components provides the ability to seal leaks up to 0.020-inches x 0.5-inches. What makes this possible is the size, strength, and durability afforded by fibrous particles, the same materials in bulletpr... [Read More]

• ASIN: B00B99U1V4
• UPC: 797496876546
• ASIN: B00B99U1V4
• Brand: Prestone
• Size: 11 Ounce
• Manufacturer: Prestone

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

It’s part of life: older cars, trucks, vans, SUVs and even RVs can develop larger leaks in their radiators and intake manifolds. If you’ve tried regular stop leak products, you know they are not powerful enough to stop these larger leaks. If you visit the service center down the street, you know just how expensive it can be to repair an intake gasket leak through a mechanic. Isn’t there a better way? There should be, which is why Bar’s Leaks designed the Liquid Copper Block Seal Intake & Radiator Stop Leak. This one-step sealer was designed to quickly and safely stop these overwhelming... [Read More]

• ASIN: B002PX91OG
• UPC: 046087011096
• ASIN: B002PX91OG
• Brand: Bar's Leaks
• Size: Pack of 1
• Manufacturer: Bar's Leaks

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

Picture this: you walk out to your driveway or garage and see fluid pooling on the floor, and immediately think about the inconvenience of visiting a mechanic, plus the costly bill that comes with the solution. What you need is a safe and easy way to stop that leak so you can get on with your day as planned. Our Bar’s Leaks Radiator Stop Leak Concentrate will do just that. At Bar’s Leaks, each of our products is easy to use. There’s no special automotive expertise required. If you can pop the hood on your car, you can use our radiator sealant and other products. Each of our solutions is ... [Read More]

• ASIN: B006GUMK2O
• UPC: 046087011966
• ASIN: B006GUMK2O
• Brand: Bar's Leaks
• Size: Pack of 1
• Manufacturer: Bar's Leaks

Bar's Leaks 1100 Head Gasket Repair - 20 oz.

Suddenly noticing your temperature gauge spring towards the high end is not the best way to start your day. School, work, errands — your daily routine should not be compromised due to head gasket problems. When you experience this problem, you probably think about the time and money that will be spent in search of a block seal solution. But there’s good news: a cracked head sealant doesn’t have to be expensive or time-consuming. Our Bar’s Leaks Head Gasket Repair is scientifically formulated to permanently seal coolant leaks that are the cause of most overheating problems. It’s easy ... [Read More]

• ASIN: B000OO04MQ
• UPC: 046087011003
• ASIN: B000OO04MQ
• Brand: Bar's Leaks
• Size: 1 Pack
• Manufacturer: Bar's Leaks

Bar's Leaks 1194 Radiator Stop Leak Concentrate - 6 oz.

Ever wish you had double the time or money? Or both? We know we do. That’s why we created the Bar’s Leaks Radiator Stop Leak 2X Concentrate. It has double the power of most other stop leak products and saves you double the time and money that it would take to get your car to the repair shop. When you need to fix a radiator leak, you don’t want to spend the time it will take to visit a mechanic. And then there’s the cost of getting a radiator stop leak solution. But getting the fix radiator leak solution you need shouldn’t be time consuming and it shouldn’t be expensive. That’s wh... [Read More]

• ASIN: B006GUMITE
• UPC: 046087011942
• ASIN: B006GUMITE
• Brand: Bar's Leaks
• Size: 11 Ounce
• Manufacturer: Bar's Leaks

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

AT-205 Re-Seal is a fast, effective and safe stop-leak for all rubber seals and gaskets. The exclusive formulation restores worn or dried out seals and is not harmful to internal bearings and components. 

• ASIN: B000NVW1LM
• UPC: 616369889363
• ASIN: B000NVW1LM
• Brand: ATP Automotive
• Manufacturer: ATP

K SEAL PERMANENT COOLANT LEAK REPAIR

K-Seal is a One Step Pour and Go Permanent Repair for a leaking coolant system. Repairs leaks in Head Gasket, Block, Radiator, Heater Core, Freeze Plug and Water Pump

• UPC: 30391261
• Model: ST5501
• Color: Multicolor
• Rating: 3.9

ID Quest A/C Stop Leak & Detector Auto Air Conditioning, 3 oz

R-134a Refrigerant With Stop Leak, Conditioners and

• UPC: 16888793
• Model: LDS-1PDQ
• Color: Multicolor
• Size: 4 oz
• Rating: 3.75

Leak Stopper Rubber Flexx Sealant

Gardner, 18 OZ, Leak Stopper Rubber Flexx Sealant, Aerosol, Stops Leaks, Seals & Protects, Easy Spray Application, Use On Roofs, Chimneys, Skylights, Gutters &

• UPC: 39086835
• Model: 0316-GA
• Color: Black

EZ Chill R-134a AC Recharge Kit with Leak Sealer Plus

This EZ Chill Kit provides 15 oz. of R-134a refrigerant to replenish your car's leaking A/C System. If the leak is coming from a rubber component such as a rubber hose, gasket, or O-ring, Leak

• UPC: 588172474
• Model: 566027013
• Rating: 2.286

Ball Doctor® Leak Sealant

Need to stop a stubborn leak in your favorite football, basketball or soccer ball? Fear not, for the Ball Doctor has the perfect answer in this easy to apply Leak Sealant, suitable for pressurized balls

• UPC: 54639348
• Model: BD-2
• Rating: 1.0

Dormont Gas Connector Leak Test Kit and Thread Sealant

Dormont Gas Connector Leak Test Kit and Thread

• UPC: 639174701

Replacement for Nu-Calgon 4050-05 EasySeal Direct Inject HVACR Leak Sealant by Insta-Seal

Replaces / Supersedes: Super Seal Flex Inject™ # 985 , Nu-Calgon EasySeal Direct Inject # 4050-05 , Replaces A/C Leak Freeze & A/C Leak Freeze with Magic Frost , Enviro-Safe Direct Inject , Sensible ,

• UPC: 492139260

(6 Pack) Bar's Leaks Original Pelletized Formula Heavy-Duty Stop Leak, 11 oz

Seal internal, external and coolant-to-oil leaks with Bar's Leaks Radiator Stop Leak. It is specially formulated to seal larger leaks better than other stop-leak products. The radiator heavy duty stop leak works safely and effectively

• UPC: 318465653
• Rating: 4.111

KRYLON K02701777 Leak Sealant,Black,12 oz.,10 min.

Leak Sealant, Net Weight 12 oz., Black, Coverage 25 sq. ft., Dry Time 10 min., Application Temperature 50 to 85 Degrees FFeaturesDry Time: 10 min.Application Temperature: 50 to 85 Degrees FColor: BlackCoverage: 25 sq. ft.Item:

• UPC: 716242544
• Model: 2701
• Color: Black

RectorSeal 45311 (00280) Ac Leak Freeze Sealant, 1.5 oz. Cartridge

Rectorseal part number 45311 (00280) 1.5oz cartridge, hose not included.AC Leak Freeze is the leading air conditioning and refrigerant leak repair solution in the US today. All products are OEM Approved and AC Leak Freeze is

• UPC: 706604077

REINZ BEST QUALITY HEAD GASKET SET 02-36855-01

• UPC: 283690122269
• Category: Gaskets & Seals
• Price: 369 GBP

GOETZE BEST QUALITY HEAD GASKET SET 21-27921-21/0

• UPC: 283712257250
• Category: Gaskets & Seals
• Price: 56 GBP

REINZ BEST QUALITY HEAD GASKET SET 02-36435-02

• UPC: 283799542064
• Category: Gaskets & Seals
• Price: 371 GBP

REINZ BEST QUALITY HEAD GASKET SET 02-53615-01

• UPC: 274290682347
• Category: Gaskets & Seals
• Price: 68 GBP

REINZ BEST QUALITY HEAD GASKET SET 02-37159-01

• UPC: 303405025054
• Category: Gaskets & Seals
• Price: 142 GBP

REINZ BEST QUALITY HEAD GASKET SET 03-38305-01

• UPC: 274290682717
• Category: Gaskets & Seals
• Price: 94 GBP

REINZ BEST QUALITY HEAD GASKET SET 02-42033-01

• UPC: 303502506082
• Category: Gaskets & Seals
• Price: 112 GBP

REINZ BEST QUALITY HEAD GASKET SET 02-36855-02

• UPC: 283799541408
• Category: Gaskets & Seals
• Price: 240 GBP

REINZ BEST QUALITY HEAD GASKET SET 03-34885-01

• UPC: 274290684099
• Category: Gaskets & Seals
• Price: 62 GBP

REINZ BEST QUALITY HEAD GASKET SET 03-34885-02

• UPC: 283799541586
• Category: Gaskets & Seals
• Price: 63 GBP