Finding your suitable engine block sealer is not easy. You may need consider between hundred or thousand products from many store. In this article, we make a short list of the best engine block sealer including detail information and customer reviews. Let’s find out which is your favorite one.
Best engine block sealer
1. K-SEAL Coolant Leak Repair, ST5501 8oz, Multi-Purpose Formula Stops Leaks in the Radiator, Head Gasket, Block, Water Pump Casing, Heater Core, and Freeze Plug - Pour and Go - Trade Trusted-Stop Leak
FeaturePermanent coolant leak repair - Just shake, pour and go
Mixes with all antifreeze
No draining or flushing
Fixes cracks and leaks in radiator, head gasket, freeze plugs, cylinder heads, heater core, water pump casing and engine blocks
If product did not seal head gasket leak, the system might be Over-pressurized, which causes back pressure and doesn't allow the product to reach the problem area, on this page below under Technical Specification is a PDF Guide with instructions to follow to complete the repair successfully
DescriptionK-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.
2. Bar's Leak HG-1 HEAD SEAL Blown Head Gasket Repair
FeatureRepairs blown head and intake gasket leaks
Seals cracked cylinder heads and blocks
Stops heater core and radiator leaks
Fixes leaking freeze and core plugs
DescriptionBar'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.
3. CRC K&W 401016 Block Seal Permanent Metallic Block & Radiator Seal - 16 Oz
FeaturePermanent molecular seal thats as strong as steel
Seals cracks & holes in cast iron and aluminum engine blocks, head gaskets, freeze plugs, and copper, aluminum and bi-material radiators & heater cores
For use in all water-cooled diesel and gasoline vehicles
Withstands extreme pressure and temperatures of a cooling system and will not wash away
Professional grade formula exceeds ASTM D6107 for effectively sealing leaks in cooling systems
4. Moroso 35500 Ceramic Engine Seal - 1 Pint
FeatureFit type: Vehicle Specific
Part number: 35500
Package Weight: 1.6 pounds
The best Chemical Sealer you can buy to stop cooling system leaks Works equally well in aluminum or cast-iron blocks Cooling system must be thoroughly clean before use Does not work with antifreeze If this doesn't stop the leaks, find yourself a welder!
5. Permatex 82194 Ultra Grey Rigid High-Torque RTV Silicone Gasket Maker, 3.5 oz.
FeatureDesigned specially for high-torque and high vibration applications
Maximum vibration resistance, with outstanding resistance to oils, cooling and shop fluids
OEM specified, guaranteed not to leak
Low odor and non-corrosive formula
Suggested Applications: Valve covers, oil pans, intake manifold end seals, timing covers, water pumps, thermostat housings
6. K&W 401232 Permanent Head Gasket & Block Repair with Nanotechnology - 32 Fl Oz
FeaturePackage length: 4.394 cm
Package width: 8.610 cm
Package height: 24.206 cm
Product Type: AUTO ACCESSORY
7. BlueDevil Head Gasket Sealer (38386)
FeatureContains no solid or particulate matter that can harm a vehicles engine
Alternative solution for costly and time consuming repairs
Safe and easy to use
8. ATP AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle
FeatureProfessional strength fast acting resealer, stops leaks fast
Rejuivinates all rubber seals & gaskets in engines, transmissions, power steering, differentials and hydraulic systems
Compatible with conventional and synthetic oils, ATF, gear oil, power steering fluids and hydraulic oil
Does not contain petroleum distillates, will not over-swell or breakdown seals
8oz bottle will treat a 6 quart capacity, adjust accordingly
9. K-SEAL Coolant Leak Repair ST5516 Heavy Duty 16oz, Multi-Purpose Formula for Truck/Tractor Coolant Leaks in the Radiator, Head Gasket, Water Pump Casing & Heater Core, A True Pour & Go -Trade Trusted
FeatureREPAIRS IN MINUTES: Create a permanent weld within the entire coolant system, including on hard plastic radiators and aluminum heads and blocks in larger capacity engines, AG, RV etc. The only industrial coolant sealant university tested to meet ASTM D3147.
SEALS CRACKS AND STOPS LEAKS: Avoid expensive downtime, our coolant stop leak will permanently seal cracks and holes! Quickly repair your head gasket, block, leaking radiator, freeze plug, heater core & water pump casing with no adverse impact on efficiency.
POUR AND GO: Our cooling system sealer is easy to use just shake the bottle, add to your radiator/overflow and run the engine! Unlike some competitive products, it mixes with all types of antifreeze, no draining, flushing or pulling the thermostat required.
SCIENTIFICALLY TESTED: Safe and effective, our Heavy Duty Coolant stop leak repair seals leaks up to 1/32 of an inch! Once cured, it withstands the high pressure of the combustion chamber, without failing or clogging the cooling system. US Bestseller
CUSTOMER SUPPORT: If our engine coolant leak doesnt seal your head gasket, the system might be over-pressurized. Check the Technical Specification section of this page for extra instructions for a successful repair. Over 8 million bottles sold. Save time/money
10. Bar's Leaks 1111 Block Seal Permanent Head Gasket Fix 24 oz.
FeatureStops block leaks
Seals cracked cylinder heads and blocks
Repairs blown head gaskets
Contains a combination of antifreeze compatible sodium silicate sealing liquid and various size gasket sealing particles which penetrate gaps & cracks and harden to permanently stop leaks.
11. BlueDevil Pour-N-Go Head Gasket Sealer
Easy to Use Pour-n-go
Used for 4 cylinder and v-6 engines
Permanently Seals Blown, Cracked or Leaking Head Gaskets
12. K&W 401224 FiberLock Head Gasket & Block Repair - 32 Fl Oz
FeatureEasy Pour and Go Formula!
Permanently fixes head gaskets, engine blocks, cooling systems, and cylinder heads.
Seals larger holes with less fluid loss than competitive products as proven by lab test (ASTM D6107)
Works with all antifreeze or plain water.
"Contains 3 unique technologies. Military-Strength Fibers create multi-layer repair over cracks with a web-like weave. Nanotechnology permanently fixes the smallest cracks and crevices. Cool-X Conditioner lowers operating temperature as it circulates through cooling system."