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CRC K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz

3.7 3.7 out of 5 stars 281 ratings

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Purchase options and add-ons

  • 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

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 5.87 x 2.31 x 2.13 inches; 1.15 Pounds
  • Item model number ‏ : ‎ 401016
  • Date First Available ‏ : ‎ July 7, 2004
  • Manufacturer ‏ : ‎ CRC
  • ASIN ‏ : ‎ B000CIPV5E
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    3.7 3.7 out of 5 stars 281 ratings

Product Description

Forms a permanent molecular bond that's as strong as steel. Seals cracks & holes in cast iron & aluminum engine blocks, head gaskets, freeze plugs, & copper, aluminum & bi-material radiators & heater cores. Tested by an Independent test lab. Rated No.1


From the brand


From the manufacturer

About us

On October 6, 1958, a Pennsylvania corporation was formed and was called Corrosion Reaction Consultants. The company began making and selling “CRC Corrosion Inhibitor” – a multi-purpose corrosion inhibitor/lubricant that with later modifications, developed into CRC 5.56.

The first CRC product came to New Zealand in 1961 as an agency line and was sold to the automotive and electrical trades.

In 1973 CRC Chemicals NZ was formed based in Wellington. In 1974 the New Zealand operation was moved to Auckland and by late 1974 small warehouses were set up in Wellington and Christchurch.

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Customer reviews

3.7 out of 5 stars
3.7 out of 5
281 global ratings

Customers say

Customers like the performance of the product. They say it works well to stop leaks in the radiator and head gasket. However, some customers have mixed opinions on the quality and sturdiness of the item.

AI-generated from the text of customer reviews

7 customers mention7 positive0 negative

Customers are satisfied with the leakage of the auto accessory. They mention that it works great to stop leaks in the radiator, head gasket, and block. Some say that it's ok for small radiator leaks but not a permanent fix.

"...We followed the direction to a tee. Sealed up perfect no leaks to this day. Thank You 😊..." Read more

"...I only have 250 miles on car so far but the internal leak has stopped. I have not added any water to cooling system after the addition of sealer...." Read more

"sealed block great" Read more

"This product really works at sealing a head gasket. Used it 3 years ago in my Civic and it’s still going strong! Bought another one to stock it." Read more

26 customers mention12 positive14 negative

Customers are mixed about the quality of the auto accessory. Some mention that it works great and is easy to use, while others say that it showed up unusable and failed after a few weeks of use.

"...of the product had solidified in the bottom of the can rendering completely useless. DO NOT WASTE YOUR MONEY" Read more

"...WATCH the video on "how to use". It is a great product...." Read more

"...Good luck. Update sealer failed after a few weeks of use. Would not buy again. Looks like no short cut in these kinds of situations...." Read more

"...She has full power and i drive her hard and no issues at all after 2000 miles and im confident she will hold for a while longer...." Read more

8 customers mention3 positive5 negative

Customers have mixed opinions about the sturdiness of the auto accessory. Some mention it's completely solid, while others say it'll break if mixed around. Some customers also report that the product came hardened and was hard as a rock inside the canister.

"...The price label reads $3.99. The product is bad and unusable (completely solid). This review is not about the product as originally made...." Read more

"Solid in can..." Read more

"Product showed up unusable. Was solid in the can. Wasn't frozen, was just old and wasn't able to try and mix it around cause it was solid...." Read more

"When I went to use the product, it was hard as a rock inside the canister. I messaged the seller, no response...." Read more

Came solid as a rock
5 Stars
Came solid as a rock
Trying to get a refund but there's no option for it. We waited over a week and this. Now I have to order it again and hopefully get a usable order.If it comes correctly it's a great product
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2.0 out of 5 stars Unfortunately this does not work
Reviewed in the United States on August 8, 2022
By the time the item arrived it felt weird. When I open it, it was thick inside it couldn't come out. If you see the picture you can tell that it looks disgusting probably even expired or defected. Not gonna buy this again :(
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3 people found this helpful
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