10 Best engine block sealer: Editor Recommended
10 Best Engine Block Sealer Reviews in 2021
SaleBestseller No. 1
K&W 401224 FiberLock Head Gasket & Block Repair - 32 Fl Oz
- Easy Pour and Go Formula!
- Permanently fixes head gaskets, engine blocks, cooling systems, and cylinder heads.
- "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...
- Seals larger holes with less fluid loss than competitive products as proven by lab test (ASTM D6107)
- Works with all antifreeze or plain water.
SaleBestseller No. 2
Blue Magic 1116 Liquid Glass Metallic Seal-Up - 22.8 oz.
- Permanent cooling system sealer
- Liquid glass and copper formula
- Seal withstands up to 2000 degrees Fahrenheit
- Forms permanent copper-ceramic seal
Bestseller No. 3
CRC K&W 401016 Block Seal Permanent Metallic Block & Radiator Seal -...
- Permanent molecular seal that’s 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
Bestseller No. 4
K-Seal ST3501 Pour and Go Permanent Head Gasket and Block Repair
- Just Pour & Go – No Need for Expensive Head Gasket Repairs - The Safe and Easy Way to Fix a Coolant Leak
- Fixes blown head gaskets, cracked heads and blocks
- A permanent repair, guaranteed for the lifetime of the engine
- Scientifically Tested - K-Seal is the only product to have been successfully tested by the equipment at Brighton University and classes as meeting the demands of ASTM D3147
- 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...
Bestseller No. 5
Steel Seal Blown Head Gasket Fix Repair Sealer - 6 Cylinder
- Permanently seals a crack in the head gasket
- Do-It-Yourself Pour in Head Gasket Fix
- Used by thousands of repair shops nationwide
- Backed with a 100% Money-Back Guarantee
- Used for 6 Cylinder Engines
Bestseller No. 6
Bar's Leaks 1109 Block Seal Liquid Copper Intake and Radiator Stop...
- Seals larger leaks seals
- Repairs heater core leaks
- Repairs freeze plug leaks
- Repairs blown head gaskets
- Repairs blocks
Bestseller No. 7
Hi-Gear HG9048s Insta-Seal Permanent Block Sealer - 8 fl. oz.
- Permanently repairs leaks in gaskets, radiators, heater cores, intake manifolds, blocks, heads and freeze plugs
- Compatible with all types of antifreeze and no draining required
- Insta-Seal fixes both large and small leaks in plastic, aluminum and cast iron intakes, heads, blocks and radiators
- Insta-Seal will not void the manufacturer's warranty
- Ceramic micro-fibers, copper and heat combine to "weld" both large and small cracks
SaleBestseller No. 8
Moroso 35500 Ceramic Engine Seal - 1 Pint
- Fit type: Vehicle Specific
- 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!
- Part number: 35500
- Package Weight: 1.6 pounds
SaleBestseller No. 9
Bar's Leaks 1111 Block Seal Permanent Head Gasket Fix 24 oz. , Brown
- Stops 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.
Bestseller No. 10
K&W 401232 Permanent Head Gasket & Block Repair with Nanotechnology -...
- Package length: 4.394 cm
- Package width: 8.610 cm
- Package height: 24.206 cm
- Product Type: AUTO ACCESSORY