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How to Repair a Gasket

Has your car suffered a blown gasket? Do you want to avoid hundreds of dollars in repair costs? Fortunately, by using a good spray-on rubber sealer, you can do just that.

Your car’s gasket can suffer a lot of wear and tear over time. The metal can corrode, leading to various engine problems and leaks. Eventually, this gasket will fail, which is known as a blown gasket. Your first reaction may be to head to the repair shop. However, fixing a blown gasket on your own is surprisingly easy, and requires very little mechanical expertise.

In today’s article, we’re going to walk you through the exact steps needed to repair your gasket. By following these steps, anybody can easily fix the valve cover gasket in their vehicle.

Supplies needed to repair a gasket:

  • A good spray-on rubber sealant (we recommend Flex Seal)
  • Engine degreaser or other engine cleaning solution
  • A brush or old rag

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Remove the valve cover gasket. Clean the oil and sludge off of it using a drop cloth. The gasket can be cleaned using any sort of engine degreaser or other engine cleaning solution. Be sure to dispose of it in an environmentally friendly way, and try not to let it flow into a nearby drain. Then, give it a good scrub. Put a particular focus on the groove around the outside of your gasket. There may be a strip of rubber in there, so remove it and clean underneath. To get into the grooves, it’s often best to use an old toothbrush or other strong-bristled brush.


Your valve cover gasket should come with its own rubber sealer – a thin strip of rubber that lies along the outside rim of the cover. If you didn’t already remove this in the previous step, do so now. Take a closer look to see how wear and tear has affected this strip.


For this step, you will need to use your spray-on rubber sealer. If the rubber strip around your valve cover gasket is in rough shape, then you can patch it up by spraying it with a rubber sealer. Or, if the strip has already been damaged beyond repair, then you may just want to spray your rubber sealant around the entire rim of the valve cover gasket and avoid using the rubber strip entirely.

Of course, if the rubber strip is still in good shape, then you should be able to re-apply it with a small amount of spray-on rubber. Ultimately, whatever solution you choose should provide a tight, sealed fit for your cover gasket and prevent further wear and tear on the area.


Replace the valve cover gasket and wait for the rubber solution to dry. After that, your car will be good to go. Congratulations! You’ve avoided paying hundreds of dollars at a mechanics shop.

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Why is Flex Seal the best way to repair a gasket?

As mentioned above, Flex Seal is clearly the best way to fix a blown gasket. Here are just a few of the reasons why we highly recommend it:

  • Affordable – Instead of paying hundreds of dollars at a mechanics shop, Flex Seal costs a measly $19.99 for two cans. It’s tough to argue against a price like that. Whether you’re on a tight budget or simply want to avoid sending a large cheque to the car mechanic, everybody can appreciate a bargain like Flex Seal.
  • Easy – Even people who know nothing about car maintenance can learn to fix a gasket with Flex Seal. With its simple, point and spray technology, you won’t find an easier solution than this.
  • Long-lasting – Rubber does not biodegrade naturally in the environment, which is why it makes an incredibly effective and long-lasting gasket sealer. Instead of providing a temporary fix, like other do it yourself solutions for a blown gasket, Flex Seal provides a comprehensive solution that will stand the test of time.
  • Multi-use – You may not use up an entire can of Flex Seal on your gasket. Fortunately, you can put your remaining spray-on rubber to good use. Flex Seal is great at fixing broken pottery, leaky roofs, pipe problems, and countless other problems that you may find around the house. In fact, after buying Flex Seal, many people simply walk around their home, can in hand, looking for various problems to solve.

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