Search Results
Products are chosen independently by our editors. Purchases made through our links may earn us a commission.
Updated
Pros
  • Effective on multiple components
  • Simple to use
  • Long-lasting results
  • Quick and effective
  • Simple application
  • Works with all coolants
Cons
  • Larger bottle size
  • May not work on severely damaged radiators
  • May not work on large leaks
  • Requires correct dosage
Bottom Line
BlueDevil Radiator and Block Sealer offers a reliable solution for sealing leaks in radiators and engine blocks. It's easy to use and works with all types of coolants.
Permatex Radiator Stop Leak provides a reliable solution for sealing minor leaks in radiators and heater cores. It's easy to use and compatible with all antifreeze types.
Size
32 oz
11 oz
Type
Liquid
Liquid
Compatibility
All antifreeze types
All antifreeze types
Height
7.25 inches
8.88 Inches
Length
2.75 inches
2.56 Inches
Weight
1 Pounds
0.45 pounds
Width
2.75 inches
2.56 Inches
Part Number
00205
30301
Model
00205
30301

When it comes to repairing leaks in your vehicle's cooling system, radiator sealants are a popular solution. Two products that stand out in this category are BlueDevil Radiator and Block Sealer and Permatex Radiator Stop Leak. Both products claim to effectively seal leaks and prevent further damage to your engine, but they have some key differences.

BlueDevil Radiator and Block Sealer

BlueDevil is a well-known brand in the automotive industry, and their Radiator and Block Sealer is a popular choice among car owners and mechanics. This product is designed to seal leaks in the radiator, block, and head gasket areas of your engine. It works by circulating through the cooling system and forming a secure bond with the metal surfaces, effectively sealing any cracks or holes.

One of the key benefits of BlueDevil Radiator and Block Sealer is its ease of use. Simply pour the product into the radiator, top off the coolant, and let the engine run for a few minutes. The sealant will then circulate through the system and start to work its magic. Additionally, BlueDevil is compatible with most types of antifreeze and coolants, making it a versatile solution for a wide range of vehicles.

Permatex Radiator Stop Leak

Permatex is another reputable brand in the automotive industry, and their Radiator Stop Leak product is designed to provide a quick and effective solution to radiator leaks. This product works by using a unique blend of chemicals that penetrate deep into the leak and form a strong, long-lasting seal.

One of the advantages of Permatex Radiator Stop Leak is its ability to target specific areas of the cooling system. Unlike some other products that may circulate through the entire system, Permatex focuses on the exact location of the leak, providing a more precise and efficient repair. Additionally, Permatex is safe to use with most types of radiators and cooling systems, including those made from aluminum, copper, and plastic.

Comparison

So, how do these two radiator sealants compare? Both products are effective at sealing leaks and preventing further damage to your engine, but they have some key differences. BlueDevil Radiator and Block Sealer is a more comprehensive solution that can seal leaks in multiple areas of the cooling system, including the block and head gasket. Permatex Radiator Stop Leak, on the other hand, is designed specifically for radiator leaks and provides a more targeted solution.

In terms of ease of use, BlueDevil is generally considered easier to apply, as it can be simply poured into the radiator and allowed to circulate through the system. Permatex, on the other hand, may require a bit more effort to apply, as it needs to be mixed with coolant and then added to the radiator.

Conclusion

When choosing between BlueDevil Radiator and Block Sealer and Permatex Radiator Stop Leak, it ultimately comes down to your specific needs and preferences. If you're looking for a comprehensive solution that can seal leaks in multiple areas of the cooling system, BlueDevil may be the better choice. However, if you're specifically looking for a product to target radiator leaks, Permatex is a great option.

Regardless of which product you choose, it's essential to follow the instructions carefully and take necessary precautions to ensure safe and effective use. Remember, radiator sealants are not a permanent fix and may need to be reapplied over time. By understanding the differences between these two products and choosing the right one for your needs, you can help extend the life of your vehicle's cooling system and prevent costly repairs down the road.