Can you use silicone to seal a exhaust?

Asked By: Neida Palacian | Last Updated: 14th May, 2020
Category: automotive auto parts
4.9/5 (5,380 Views . 37 Votes)
You can use silicone on the join to the head as it is cooled by the head itself and does not get that hot. The Y piece joins generally run to hot for even the hi temp silicone and it burns off and the join then tends to leak. The last join to the rear muffler is normally cool enough again to use silicone I have found.

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Subsequently, one may also ask, what can I use to seal my exhaust joints?

Permatex Muffler and Tailpipe Sealer seals holes and repairs leaks in mufflers, tailpipes, catalytic converters and around joints. This sealer makes new installations more secure, is shock resistant, high temperature resistant, and is waterproof for all weather conditions.

Secondly, do exhaust gaskets need sealant? You shouldn't need to use sealant on the gaskets. Most exhaust manifold gaskets either come with their own sealant (like Fel-Pro's do with the silver looking stuff), or they are metal and don't require it either. If you don't, you could have slight low spots in your manifold which could allow for exhaust leakage.

Subsequently, one may also ask, what is the best exhaust sealant?

Permatex Muffler and Tailpipe Sealer is the best sealant to use on exhaust joints. This sealant is good for new instalments since it is waterproof, resistant to high temperatures, and shock-resistant, thus making. This makes the exhaust joints more secure in all weather conditions.

Can I use silicone sealant on my car?

Black Silicone Sealant Excellent for sealing joints, gaps and cracks inside, outside and underneath the car, such as sealing of leaking window joints and water hoses, low temperature gasket applications, and replacing of windscreens.

39 Related Question Answers Found

Can I use Flex Seal on my exhaust?

If you have a hole in your exhaust, you can patch it with Flex Tape. Take a second piece of Flex Tape and wrap it around the entire exhaust – including the first patch that you attached.

Will Exhaust Wrap fix a leak?

If things like to break things and you want to unbreak them, the Heat Wrap is just the thing to fix all your household repairs such as cracked pipes and furnace leaks. The Fiber Fix Heat Wrap hardens like steel and can withstand temperatures up to 850 degrees Fahrenheit.

How do you cover an exhaust leak?

Method 2 Sealing a Leak with Repair Epoxy or Exhaust Tape
  1. Scrub the area surrounding the leak with a steel toothed brush.
  2. Use sandpaper to prepare the surface of the pipe.
  3. Wipe the surface down with acetone.
  4. Determine if the hole is small enough to be sealed without a patch.
  5. Wrap the exhaust tape around the pipe.

How do you use exhaust assembly paste?

Product Usage
Use mechanical abrasion to clean porous surfaces before application. Surfaces may be slightly damp but not running wet. Apply Exhaust Assembly Paste to the prepared surfaces evenly ensuring good contact and assemble the joint.

Does muffler tape really work?


Does muffler tape really work? The truth is that the jury is still out on the effectiveness of muffler tape, but most mechanics agree that it's a temporary fix at best. Even a small hole cannot be welded because the metal on a muffler is too thin,” Hrovat says.

How do you seal a catalytic converter?

Shut down the engine and allow the catalytic converter to cool down. Place a piece of steel putty onto the leak. Push on the putty using your finger to seal the leak. Smooth the putty using your finger to make it flush with the catalytic converter.

Why does my exhaust leak fluid?

If you see liquid dripping out of the tailpipe, don't panic. It normal and harmless condensation of water vapor This is caused by the exhaust system getting really hot, then cooling down, which causes moisture to collect, or condense, in the muffler and pipes.

Can RTV be used on exhaust?

The most advanced, high temp RTV silicone gasket available. Three times more oil resistant than conventional silicones; eight times more flexible than cut gaskets. The best silicone for exhaust pipes, exhaust manifolds, and other areas subject to high heat.

How strong is muffler cement?


MufflerSeal Muffler Cement - 6 oz
MufflerSeal Muffler Cement is a metal containing paste that prevents and seals leaks at seams and gaps of pipe and exhaust connection points. When fully cured, this paste dries to a cement-like hardness that is heat resistant up to 700° F.

How hot does an exhaust get?

Exhaust system temperatures
While the average temperature for the exhaust is 300 to 500 degrees, you still can experience temperatures as high as 1200 whenever there is a constriction in the exhaust system. You should be on the lookout for bends on the exhaust pipe.

Should I use gasket sealer with a gasket?

A general rule, if you are using gasket sealant, you don't need a lot! Gasket sealant can be used to make cheaper gasket materials more robust, increasing adhesion and chemical/water resistance. RTV sealants are Room Temperature Vulcanising and needs to be at room temperature to cure.

Should you use gasket sealer on headers?

No gasket, no sealant. If the mating surfaces are clean and smooth and flat, high temp sealant will work just fine on your headers. A gasket might need periodic retightening, as it slowly crushes due to heat and years..

What is the best gasket sealant?

The Best Gasket Sealer
  1. ATP Automotive Re-Seal Stops Leaks.
  2. Permatex 81160 High-Temp Red Silicone Gasket.
  3. BlueDevil Products Head Gasket Sealer.
  4. 3M Ultrapro Black High Temp Silicone Gasket Tube.
  5. Permatex 80019 Aviation Form-A-Gasket No.
  6. Gasgacinch 440-A Gasket Sealer and Belt Dressing.
  7. Edelbrock 9300 Gasgacinch Gasket Sealer.

Do metal gaskets need sealant?


Metal/Plastic Carrier Gaskets
Sealants can act as a lubricant and cause the rubber gasket to slip out of place and split. Most replacement gasket manufacturers will include instructions for installation that will outline if sealants need to be applied. Surface Finish: The sealing surfaces should be dry and clean.

Can I use RTV instead of a gasket?

It is fine to use the correct RTV sealant instead of a gasket if used in the right application (oil, high temp, fuel). Not, however, if the gasket thickness is required to produce a specific amount of clearance. RTV sealant is better than primitive gaskets in most applications ie.

How do you seal an exhaust manifold leak?

How to Fix a Leak in an Exhaust Manifold
  1. Replace defective gaskets or seals. Use a socket wrench and wrench set to remove the manifold.
  2. Inspect the flange where the manifold bolts to the engine. If there was not a gasket when the manifold was removed, this is normal.
  3. Remove cracked manifolds and have them repaired, or replace them with a new part.