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Posted: 02/25/2022

Do Radiator Sealants Really Work?

The answer to this question is yes, radiator sealants really do work. However, they are not a miracle solution, and are only good for a temporary fix. Even so-called “permanent” sealants will only last for months, not years. A good radiator sealant–also called a stop-leak–can seal all kinds of cooling system leaks. It can fix the leaks inside a radiator by sealing the pores. When used correctly, a radiator stop-leak can effectively seal mild leaks in a car. Leaking from the head gasket, engine block, or water pump can be fixed with a sealant. As always, follow the instructions carefully when using a stop-leak.

Radiator Sealants




Are Radiator Sealants Permanent?

While these products work to fix small leaks, they are not a permanent fix for long-term leaks. While some sealants can last for a long time, others may not be as durable. It all depends on the brand and the formulation of the sealant. Ultimately, it is important to read the manufacturer's directions carefully to see how long the sealant is supposed to last. In most cases, however, you will need to reapply the sealant at some point in order to maintain your car's cooling system. You'll probably need a professional technician to fix a leaky head and get it repaired properly. 

Radiator Sealants



How Long Does a Radiator Sealant Last?

Depending on the severity of the leak, it can last from 10 to 50 thousand miles. In a severe case, the solution may not work at all. If your car is leaking, you should look for a better radiator repair solution.

Pick the Right Sealant For Your Vehicle

There are several types of sealants on the market. To find the right one for your car, read reviews and ratings. Check the formula of the sealant, too. Different formulas will affect your engine differently. When buying a radiator sealant, do your research and make sure you're getting the best possible product for your car. You should look for the one that matches the formula and your needs.

Radiator Sealants



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Arnold Motor Supply has been a leading supplier of auto parts since 1927. Founded and based in Iowa,  we have locations all over the midwest. Order your parts today and you'll be notified via email once your purchase is ready for pickup at your local Arnold Motor Supply or Auto Value parts store.





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