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

4.0 4.0 out of 5 stars 853 ratings

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32 Fluid Ounces

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  • PERMANENT FIX: Seals larger holes with less fluid loss than competitive products to permanently repair leaks in 30 minutes or less.
  • EASY TO USE: Our easy; pour-in formula allows you to fix leaks without having to drain your cooling system.
  • PREMIUM FORMULA: Contains military strength fibers to create multi-layer repair over cracks with a web-like weave. Nanotechnology permanently fixes the smallest cracks and crevices. Lowers operating temperature as it circulates through cooling system.
  • PRODUCT SPECIFICATIONS: CRC FiberLock Head Gasket & Block Repair is available in a 32 fl oz bottle.
  • CRC INDUSTRIES: A market leader that offers impeccably designed chemical solutions to maintain; protect and repair different marine; heavy-duty motor vehicles; industrial-grade engines; household tools and electrical equipment.
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K&W 401224 FiberLock Head Gasket & Block Repair - 32 Fl Oz
K&W 401224 FiberLock Head Gasket & Block Repair - 32 Fl Oz
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Price-31% $33.32
List:$48.00
$28.99$28.95-28% $46.52
List:$64.99
Delivery
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Customer Ratings
Easy to use
3.8
4.3
3.9
Value for money
3.7
3.7
3.5
Mileage
3.5
3.6
3.4
Sold By
Amazon.com
Maplefield
Amazon.com
B and S Supply

From the brand


From the manufacturer

fiberlock, feature image, pour and go, head gasket, block, repair
why choose K&W, mechanic

fibers, military strength, strong

nanotechnology

conditioning, coolx

radiator, how to use

MILITARY STRENGTH FIBERS

Contains sodium silicate reinforced with military-strength proprietary fibers with a high strength-to-weight ratio. The fibers form an interlocking web-like weave over the crack or breach ensuring a permanent, multi-layer, impenetrable repair.

NANOTECHNOLOGY

Features nanoparticles so small they reach into cracks and crevices other products can't. This makes the molecular bond of the repair stronger and more solid when permanently hardened to the surface area.

COOL-X CONDITIONER

Cool-X Conditioner circulates in the cooling system for lower operating temperatures and improved heat transfer long after the repair is made.

HOW TO USE

K&W FIBERLOCK is compatible with all antifreeze or plain water (generally for racing applications). Shake bottle vigorously for 30 seconds, pour directly into the radiator, turn heater on high and idle engine for 15 minutes. You're ready to drive. FIBERLOCK will form a permanent repair over time. Read label for complete instructions.

Product Description

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.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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


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Customer reviews

4 out of 5 stars
4 out of 5
853 global ratings

Customers say

Customers have expressed concerns about the quality, clogging, and cooling of the gasket. For example, they mention that it completely damaged their engine, causing them to buy a new engine. Opinions are mixed on leakage, performance, ease of use, and value.

AI-generated from the text of customer reviews

70 customers mention39 positive31 negative

Customers are mixed about the performance of the gasket. Some mention that it works great, while others say that it fails to work as described.

"It worked can not believe that it completely worked ! Just follow directions exactly what it wants to be done, and it worked perfect for me !!!" Read more

"...it time to seal with out the extra compression blowing out but it failed to work. basically it works on minor leaks but not major ones...." Read more

"...So far it has work perfectly and seems to have sealed the gasket completely but even if it does begin to leak slightly, it says that you can add..." Read more

"...double-your-money back if the product is used properly, but fails to work as described...." Read more

41 customers mention22 positive19 negative

Customers are mixed about the leakage of the gasket. Some mention that the leak was stopped, while others say that the seal was broken and water trickled out.

"...So far it has work perfectly and seems to have sealed the gasket completely but even if it does begin to leak slightly, it says that you can add..." Read more

"...The water trickled out just from filling it. Dumped a half bottle in and haven't leaked a drop since it sealed up after 10 15 miles" Read more

"...The leaks stopped almost immediately, and I ran the engine for a good 20 minutes like this. No overheating was apparent...." Read more

"...I had a slight leak out of a joint by the thermostat housing. I had to add coolant only a couple times per year...." Read more

26 customers mention17 positive9 negative

Customers are mixed about the value of the gasket. Some mention that it's worth the penny, saves them a lot of money, and is an excellent product. However, others say that it is useless and not worth the money.

"...a temp sensor go bad, but not certain it was related and this is a cheap fix. The car never leaked again for the year or so I owned it after" Read more

"...What a stupid, costly mistake it was to use this product to solve anything other than a head gasket leak...." Read more

"Awesome product! Worth the penny! This is a staple that my husband keep in our garage at all times...." Read more

"This is one of the Best products I have used...." Read more

8 customers mention5 positive3 negative

Customers are mixed about the ease of use of the gasket. Some mention it's super easy to use and saves them a lot of work, while others say it'll take a long time to put together.

"...drive and hasn't leaked a drop since, Very impressed, this saved me a lot of work, follow the directions!" Read more

"Not simple, but effective. After doing all the homework and visiting car forums. I arrived at the correct way to use this product more effectively...." Read more

"Super easy to use, couldn't even imagine that this would work but still driving today, over 25k miles since use. Damn straight would buy again...." Read more

"easy to follow directions" Read more

7 customers mention3 positive4 negative

Customers have mixed opinions about the gasket. Some mention that the white smoke is gone and the heater works again, while others say that the car is still running rough and blowing white smoke from the exhaust.

"...After several days of driving, it no longer overheats, no longer produces white smoke from the coolant leaking through the gasket into the engine,..." Read more

"I had white smoke and no heat because coolant was low I had a head gasket leak at 121,000 miles on my ford explorer v6 used a different product and..." Read more

"...I have to say I was surprised and so far it has worked! No white water vapor in the morning, no rough running and the car seems to have more power...." Read more

"...My expansion reservoir also smelled heavily of exhaust fumes. I followed the instructions to the letter...which I suggest you do as well...." Read more

37 customers mention10 positive27 negative

Customers are dissatisfied with the cooling of the gasket. They mention that it overheats, causing white smoke and no heat. The product reacts to heat and air, clogging radiator fins and heater core.

"...following the directions and using the product, my vehicle immediately started to overheat...." Read more

"...and ran the engine as instructed, next day and on after, i lost heat in my heatercore, it clogged the smaller pipes and thermostate, had the flush..." Read more

"...After several days of driving, it no longer overheats, no longer produces white smoke from the coolant leaking through the gasket into the engine,..." Read more

"...this car (A COUPLE WEEKS) before I realized there was an issue with the head/cooling system...." Read more

10 customers mention0 positive10 negative

Customers are dissatisfied with the clogging of the gasket. They mention that it clogged their radiator, heater core, and coolant system. Customers also report that the product contains nano fibers that clog the radiator fins and heater core.

"...day and on after, i lost heat in my heatercore, it clogged the smaller pipes and thermostate, had the flush out the whole system and unclog all the..." Read more

"...The leak was stopped, but the radiator was completely clogged by product, but, replacing radiator was a lot cheaper than replacing head or head..." Read more

"...35 Miles; It Also Clogged the Radiator and It Literally Blew Up...." Read more

"...overheating seemed to release large deposits of “nano fibers”, clogged radiator fins, heater core, the degassing hose that connects from the neck to..." Read more

7 customers mention0 positive7 negative

Customers are dissatisfied with the quality of the gasket. They mention that it completely damaged their engine and clogged the radiator. Some say that the product did not work as expected and caused them to buy a new engine.

"...They called me and told me that it was a cracked engine block...." Read more

"...35 Miles; It Also Clogged the Radiator and It Literally Blew Up...." Read more

"my motor block was cracked and this stuff fixed it right up!! i can’t believe how easy it was!!" Read more

"...It ended up locking up, froze my engine cracking my block the next morning. I had buy a whole brand new engine...." Read more

Only if you are very desparate
1 Star
Only if you are very desparate
I would only recommend this product if you are facing a cost prohibitive repair (head gasket).I had a slight leak out of a joint by the thermostat housing. I had to add coolant only a couple times per year. I did a bunch of repairs to my vehicle so I thought I would go for perfect and stop this little leak before it became a big leak. Hello FiberLock, goodbye $955!After carefully following the directions and using the product, my vehicle immediately started to overheat. This should have been clear to happen as the product is clumpy/gunky. I should have just stopped when I saw that junk come out.I paid for two cooling system flushes ($280) that didn't fix it; one thermostat swap ($200) that didn't fix it and finally one new radiator with pressure flush ($475) that seems to have fixed it.I cannot imagine your radiator would not get clogged up. If you use this product, you should expect to pay for a new radiator and pressure flush. What a stupid, costly mistake it was to use this product to solve anything other than a head gasket leak. The bottle says it permanently fixes "cooling systems" so trusted it. Don't be stupid like me.
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EQ
1.0 out of 5 stars Only if you are very desparate
Reviewed in the United States on June 1, 2019
I would only recommend this product if you are facing a cost prohibitive repair (head gasket).

I had a slight leak out of a joint by the thermostat housing. I had to add coolant only a couple times per year. I did a bunch of repairs to my vehicle so I thought I would go for perfect and stop this little leak before it became a big leak. Hello FiberLock, goodbye $955!

After carefully following the directions and using the product, my vehicle immediately started to overheat. This should have been clear to happen as the product is clumpy/gunky. I should have just stopped when I saw that junk come out.

I paid for two cooling system flushes ($280) that didn't fix it; one thermostat swap ($200) that didn't fix it and finally one new radiator with pressure flush ($475) that seems to have fixed it.

I cannot imagine your radiator would not get clogged up. If you use this product, you should expect to pay for a new radiator and pressure flush. What a stupid, costly mistake it was to use this product to solve anything other than a head gasket leak. The bottle says it permanently fixes "cooling systems" so trusted it. Don't be stupid like me.
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